Serious mental illness or disorder impairing a person's capacity to function normally and safely

• alienation

  1. The act of alienating or the condition of being alienated; estrangement:
  2. Emotional isolation or dissociation.
  3. The act of transferring property or title to it to another.

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  1. The act of alienating or the condition of being alienated; estrangement:
  2. Emotional isolation or dissociation.
  3. The act of transferring property or title to it to another.

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• aberration

  1. A deviation from what is considered proper or normal.
  2. A departure from what is typical:
  3. A disorder or abnormal alteration in one's mental state.

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  1. A deviation from what is considered proper or normal.
  2. A departure from what is typical:
  3. A disorder or abnormal alteration in one's mental state.

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• mania

  1. An excessively intense enthusiasm, interest, or desire:
  2. A manifestation of bipolar disorder, marked usually by high energy, racing thoughts, irritability, and rapid speech.

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  1. An excessively intense enthusiasm, interest, or desire:
  2. A manifestation of bipolar disorder, marked usually by high energy, racing thoughts, irritability, and rapid speech.

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• unbalance

  1. To upset the balance of; cause to become unsteady.
  2. To upset the stability or equilibrium of:
  3. To cause (a person or the mind) to be unbalanced.

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  1. To upset the balance of; cause to become unsteady.
  2. To upset the stability or equilibrium of:
  3. To cause (a person or the mind) to be unbalanced.

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• psychopathy

  1. Mental disorder, especially antisocial personality disorder.

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  1. Mental disorder, especially antisocial personality disorder.

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• mental illness

  1. Any of various disorders characterized by impairment of an individual's thoughts, emotions, or social functioning, including schizophrenia and mood disorders such as bipolar disorder.

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  1. Any of various disorders characterized by impairment of an individual's thoughts, emotions, or social functioning, including schizophrenia and mood disorders such as bipolar disorder.

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• madness

  1. The condition of being mentally deranged.
  2. Great folly:
  3. Enthusiasm; excitement:

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  1. The condition of being mentally deranged.
  2. Great folly:
  3. Enthusiasm; excitement:

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• lunacy

  1. Mental derangement; craziness:
  2. Intermittent mental derangement attributed to the changing phases of the moon.
  3. Great or wild foolishness:

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  1. Mental derangement; craziness:
  2. Intermittent mental derangement attributed to the changing phases of the moon.
  3. Great or wild foolishness:

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• insaneness

  1. insanity; madness
  2. Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.

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  1. insanity; madness
  2. Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.

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• disturbance

  1. The act of disturbing:
  2. The condition of being disturbed:
  3. Something that disturbs, as a commotion, scuffle, or public tumult.

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  1. The act of disturbing:
  2. The condition of being disturbed:
  3. Something that disturbs, as a commotion, scuffle, or public tumult.

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• derangement

  1. The property of being deranged.
  2. An act or instance of deranging.
  3. (mathematics) A permutation of a set such that no element is in its previous position.

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  1. The property of being deranged.
  2. An act or instance of deranging.
  3. (mathematics) A permutation of a set such that no element is in its previous position.

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• dementia

  1. Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is sometimes accompanied by emotional disturbance and personality changes.

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  1. Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is sometimes accompanied by emotional disturbance and personality changes.

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• craziness

  1. (uncountable) The state of being broken in mind; imbecility or weakness of intellect; derangement.
  2. (uncountable) The state of being broken down or weakened; as, the craziness of a ship, or of the limbs.
  3. (countable) The result or product of being crazy.

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  1. (uncountable) The state of being broken in mind; imbecility or weakness of intellect; derangement.
  2. (uncountable) The state of being broken down or weakened; as, the craziness of a ship, or of the limbs.
  3. (countable) The result or product of being crazy.

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• brainsickness

  1. The quality of being brainsick; mental confusion or giddiness

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  1. The quality of being brainsick; mental confusion or giddiness

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Foolish behavior

• craziness

  1. (uncountable) The state of being broken in mind; imbecility or weakness of intellect; derangement.
  2. (uncountable) The state of being broken down or weakened; as, the craziness of a ship, or of the limbs.
  3. (countable) The result or product of being crazy.

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  1. (uncountable) The state of being broken in mind; imbecility or weakness of intellect; derangement.
  2. (uncountable) The state of being broken down or weakened; as, the craziness of a ship, or of the limbs.
  3. (countable) The result or product of being crazy.

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• zaniness

  1. The state or condition of being zany.

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  1. The state or condition of being zany.

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• tomfoolery

  1. Foolish behavior.
  2. Something trivial or foolish; nonsense.

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  1. Foolish behavior.
  2. Something trivial or foolish; nonsense.

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• silliness

  1. (uncountable) That which is perceived as silly or frivolous.
  2. (countable) An act that is silly; a result of being silly.

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  1. (uncountable) That which is perceived as silly or frivolous.
  2. (countable) An act that is silly; a result of being silly.

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• senselessness

  1. The state of being senseless.

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  1. The state of being senseless.

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• preposterousness

  1. The quality of being preposterous.

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  1. The quality of being preposterous.

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• nonsense

  1. Words or signs having no intelligible meaning:
  2. Subject matter, behavior, or language that is foolish or absurd.
  3. Extravagant foolishness or frivolity:

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  1. Words or signs having no intelligible meaning:
  2. Subject matter, behavior, or language that is foolish or absurd.
  3. Extravagant foolishness or frivolity:

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• madness

  1. The condition of being mentally deranged.
  2. Great folly:
  3. Enthusiasm; excitement:

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  1. The condition of being mentally deranged.
  2. Great folly:
  3. Enthusiasm; excitement:

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• lunacy

  1. Mental derangement; craziness:
  2. Intermittent mental derangement attributed to the changing phases of the moon.
  3. Great or wild foolishness:

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  1. Mental derangement; craziness:
  2. Intermittent mental derangement attributed to the changing phases of the moon.
  3. Great or wild foolishness:

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• imbecility

  1. Great stupidity or foolishness.
  2. Something, such as an act or suggestion, that is considered stupid or foolish.

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  1. Great stupidity or foolishness.
  2. Something, such as an act or suggestion, that is considered stupid or foolish.

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• idiocy

  1. Extreme folly or stupidity.
  2. A foolish or stupid utterance or deed.

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  1. Extreme folly or stupidity.
  2. A foolish or stupid utterance or deed.

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• foolishness

  1. (uncountable) The state of being foolish.
  2. (countable) A thing or event that is foolish, or an absurdity.

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  1. (uncountable) The state of being foolish.
  2. (countable) A thing or event that is foolish, or an absurdity.

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• foolery

  1. Foolish behavior or speech.
  2. An instance of foolish behavior or speech; a jest.

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  1. Foolish behavior or speech.
  2. An instance of foolish behavior or speech; a jest.

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• folly

  1. Lack of good sense, understanding, or foresight:
  2. An act or instance of foolishness:
  3. A costly undertaking having an absurd or ruinous outcome.

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  1. Lack of good sense, understanding, or foresight:
  2. An act or instance of foolishness:
  3. A costly undertaking having an absurd or ruinous outcome.

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• absurdity

  1. the quality or state of being absurd; nonsense
  2. an absurd idea or thing

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  1. the quality or state of being absurd; nonsense
  2. an absurd idea or thing

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Mental derangement

• aberration

  1. A deviation from what is considered proper or normal.
  2. A departure from what is typical:
  3. A disorder or abnormal alteration in one's mental state.

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  1. A deviation from what is considered proper or normal.
  2. A departure from what is typical:
  3. A disorder or abnormal alteration in one's mental state.

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• craziness

  1. (uncountable) The state of being broken in mind; imbecility or weakness of intellect; derangement.
  2. (uncountable) The state of being broken down or weakened; as, the craziness of a ship, or of the limbs.
  3. (countable) The result or product of being crazy.

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  1. (uncountable) The state of being broken in mind; imbecility or weakness of intellect; derangement.
  2. (uncountable) The state of being broken down or weakened; as, the craziness of a ship, or of the limbs.
  3. (countable) The result or product of being crazy.

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• mania

  1. An excessively intense enthusiasm, interest, or desire:
  2. A manifestation of bipolar disorder, marked usually by high energy, racing thoughts, irritability, and rapid speech.

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  1. An excessively intense enthusiasm, interest, or desire:
  2. A manifestation of bipolar disorder, marked usually by high energy, racing thoughts, irritability, and rapid speech.

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• phobia

  1. A persistent, abnormal, and irrational fear of a specific thing or situation that compels one to avoid it, despite the awareness and reassurance that it is not dangerous.
  2. A strong fear, dislike, or aversion.

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  1. A persistent, abnormal, and irrational fear of a specific thing or situation that compels one to avoid it, despite the awareness and reassurance that it is not dangerous.
  2. A strong fear, dislike, or aversion.

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• psychoneurosis

  1. Neurosis. No longer used in psychiatric diagnosis.

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  1. Neurosis. No longer used in psychiatric diagnosis.

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• neurosis

  1. A psychological state characterized by excessive anxiety or insecurity, compensated for by various defense mechanisms and lacking evidence of neurologic or other organic disease. No longer used in psychiatric diagnosis.

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  1. A psychological state characterized by excessive anxiety or insecurity, compensated for by various defense mechanisms and lacking evidence of neurologic or other organic disease. No longer used in psychiatric diagnosis.

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• alienation

  1. The act of alienating or the condition of being alienated; estrangement:
  2. Emotional isolation or dissociation.
  3. The act of transferring property or title to it to another.

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  1. The act of alienating or the condition of being alienated; estrangement:
  2. Emotional isolation or dissociation.
  3. The act of transferring property or title to it to another.

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• psychosis

  1. An acute or chronic mental state marked by loss of contact with reality, disorganized speech and behavior, and often by hallucinations or delusions, seen in certain mental illnesses, such as schizophrenia, and other medical disorders.

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  1. An acute or chronic mental state marked by loss of contact with reality, disorganized speech and behavior, and often by hallucinations or delusions, seen in certain mental illnesses, such as schizophrenia, and other medical disorders.

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• lunacy

  1. Mental derangement; craziness:
  2. Intermittent mental derangement attributed to the changing phases of the moon.
  3. Great or wild foolishness:

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  1. Mental derangement; craziness:
  2. Intermittent mental derangement attributed to the changing phases of the moon.
  3. Great or wild foolishness:

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• amentia

  1. Mental retardation.
  2. Lack of development of intellectual capacity as a result of inadequate brain tissue.

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  1. Mental retardation.
  2. Lack of development of intellectual capacity as a result of inadequate brain tissue.

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• dementia

  1. Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is sometimes accompanied by emotional disturbance and personality changes.

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  1. Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is sometimes accompanied by emotional disturbance and personality changes.

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• madness

  1. The condition of being mentally deranged.
  2. Great folly:
  3. Enthusiasm; excitement:

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  1. The condition of being mentally deranged.
  2. Great folly:
  3. Enthusiasm; excitement:

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• psychopathy

  1. Mental disorder, especially antisocial personality disorder.

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  1. Mental disorder, especially antisocial personality disorder.

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• derangement

  1. The property of being deranged.
  2. An act or instance of deranging.
  3. (mathematics) A permutation of a set such that no element is in its previous position.

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  1. The property of being deranged.
  2. An act or instance of deranging.
  3. (mathematics) A permutation of a set such that no element is in its previous position.

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• mental-disorder

  1. Any of various disorders, such as schizophrenia, bipolar disorder, or autism spectrum disorder, characterized by a distressing or disabling impairment of an individual's cognitive, emotional, or social functioning.

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  1. Any of various disorders, such as schizophrenia, bipolar disorder, or autism spectrum disorder, characterized by a distressing or disabling impairment of an individual's cognitive, emotional, or social functioning.

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• mental illness

  1. Any of various disorders characterized by impairment of an individual's thoughts, emotions, or social functioning, including schizophrenia and mood disorders such as bipolar disorder.

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  1. Any of various disorders characterized by impairment of an individual's thoughts, emotions, or social functioning, including schizophrenia and mood disorders such as bipolar disorder.

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Utter folly

• foolhardiness

  1. The quality of being foolhardy.

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  1. The quality of being foolhardy.

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• foolishness

  1. (uncountable) The state of being foolish.
  2. (countable) A thing or event that is foolish, or an absurdity.

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  1. (uncountable) The state of being foolish.
  2. (countable) A thing or event that is foolish, or an absurdity.

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• senselessness

  1. The state of being senseless.

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  1. The state of being senseless.

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