Afflicted with or exhibiting irrationality and mental unsoundness

• brainsick

  1. (Archaic) Having or caused by a mental disorder

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  1. (Archaic) Having or caused by a mental disorder

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• crazy

  1. Intensely involved or preoccupied:
  2. Out of control.
  3. In love; experiencing romantic feelings.

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  1. Intensely involved or preoccupied:
  2. Out of control.
  3. In love; experiencing romantic feelings.

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• daft

  1. Foolish; stupid.
  2. Insane; crazy
  3. Crazy; deranged.

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  1. Foolish; stupid.
  2. Insane; crazy
  3. Crazy; deranged.

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• demented

  1. Insane or mentally ill.
  2. Mentally deranged; insane; mad
  3. (Informal) Crazy or foolish.

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  1. Insane or mentally ill.
  2. Mentally deranged; insane; mad
  3. (Informal) Crazy or foolish.

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• disordered

  1. Physically or mentally ill.
  2. Put out of order; jumbled
  3. Chaotic; without clear order; in a state of disorder.

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  1. Physically or mentally ill.
  2. Put out of order; jumbled
  3. Chaotic; without clear order; in a state of disorder.

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• distraught

  1. Driven mad; crazed
  2. Deeply hurt, saddened, or worried; distressed.
  3. Extremely troubled; mentally confused; distracted; harassed

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  1. Driven mad; crazed
  2. Deeply hurt, saddened, or worried; distressed.
  3. Extremely troubled; mentally confused; distracted; harassed

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• dotty

  1. Amusingly eccentric or unconventional.
  2. Mentally unbalanced; crazy.
  3. (Informal) Feebleminded or crazy

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  1. Amusingly eccentric or unconventional.
  2. Mentally unbalanced; crazy.
  3. (Informal) Feebleminded or crazy

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• insane

  1. Intended for use by such persons:
  2. Not sane; mentally ill or deranged; demented; mad
  3. Characteristic of or associated with persons who are mentally deranged:

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  1. Intended for use by such persons:
  2. Not sane; mentally ill or deranged; demented; mad
  3. Characteristic of or associated with persons who are mentally deranged:

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• lunatic

  1. Of or for people who are mentally deranged.
  2. Of or for insane persons
  3. Suffering from lunacy; insane

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  1. Of or for people who are mentally deranged.
  2. Of or for insane persons
  3. Suffering from lunacy; insane

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• mad

  1. Angry; resentful:
  2. Angry or provoked
  3. (Slang) Excellent; wonderful:

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  1. Angry; resentful:
  2. Angry or provoked
  3. (Slang) Excellent; wonderful:

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• maniac

  1. Of, having, or showing mania; maniacal

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  1. Of, having, or showing mania; maniacal

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• maniacal

  1. Wildly irresponsible:
  2. Of, having, or showing mania; wildly insane; raving
  3. Like a maniac; insane; frenzied.

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  1. Wildly irresponsible:
  2. Of, having, or showing mania; wildly insane; raving
  3. Like a maniac; insane; frenzied.

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• mentally ill

  1. Having a mental illness.
  2. Having a psychological disorder.

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  1. Having a mental illness.
  2. Having a psychological disorder.

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• moonstruck

  1. (By extension) Showing irrational behaviour, especially of a romantic or sentimental nature.
  2. Affected mentally in some way, supposedly by the influence of the moon
  3. Mentally deranged; crazy.

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  1. (By extension) Showing irrational behaviour, especially of a romantic or sentimental nature.
  2. Affected mentally in some way, supposedly by the influence of the moon
  3. Mentally deranged; crazy.

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• off

  1. Started on the way; going:
  2. Somewhat crazy; eccentric:
  3. Not correct; in error; wrong

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  1. Started on the way; going:
  2. Somewhat crazy; eccentric:
  3. Not correct; in error; wrong

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• touched

  1. Slightly mentally deficient; touched in the head.
  2. Emotionally moved (by), made to feel emotion (by).
  3. Emotionally affected; moved:

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  1. Slightly mentally deficient; touched in the head.
  2. Emotionally moved (by), made to feel emotion (by).
  3. Emotionally affected; moved:

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• unbalanced

  1. Not treating all sides with due importance:
  2. Not in balance or in proper balance.
  3. Showing or marked by erratic or volatile emotions or behavior.

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  1. Not treating all sides with due importance:
  2. Not in balance or in proper balance.
  3. Showing or marked by erratic or volatile emotions or behavior.

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• unsound

  1. Not safe, firm, or solid; insecure
  2. Not true or logically valid; fallacious:
  3. In horse management an unsound horse is one suffering ill-health that affects its suitability for its intended work.

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  1. Not safe, firm, or solid; insecure
  2. Not true or logically valid; fallacious:
  3. In horse management an unsound horse is one suffering ill-health that affects its suitability for its intended work.

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• wrong

  1. Not in conformity with fact or truth; incorrect or erroneous:
  2. Not fitting or suitable; inappropriate or improper:
  3. Contrary to conscience, morality, or law:

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  1. Not in conformity with fact or truth; incorrect or erroneous:
  2. Not fitting or suitable; inappropriate or improper:
  3. Contrary to conscience, morality, or law:

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• bonkers

  1. (Informal) irrational, crazy
  2. (Slang) Crazy, enraged, etc.
  3. Crazy:

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  1. (Informal) irrational, crazy
  2. (Slang) Crazy, enraged, etc.
  3. Crazy:

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• cracked

  1. Having a harsh or dissonant tone:
  2. Broken or fractured, usually without complete separation of parts; having a crack or cracks
  3. (Informal) Mentally deranged; crazy.

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  1. Having a harsh or dissonant tone:
  2. Broken or fractured, usually without complete separation of parts; having a crack or cracks
  3. (Informal) Mentally deranged; crazy.

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• daffy

  1. Frolicsome in a giddy way
  2. A little crazy
  3. Crazy; foolish; silly

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  1. Frolicsome in a giddy way
  2. A little crazy
  3. Crazy; foolish; silly

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• gaga

  1. Carried away as by love or enthusiasm
  2. Mentally confused; crazy
  3. Silly; crazy.

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  1. Carried away as by love or enthusiasm
  2. Mentally confused; crazy
  3. Silly; crazy.

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• loony

  1. (Of a person) insane
  2. Mentally deranged; crazy.
  3. Crazy; demented

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  1. (Of a person) insane
  2. Mentally deranged; crazy.
  3. Crazy; demented

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• bananas

  1. Out of one's mind; crazy:
  2. Wildly enthusiastic, excited, etc.
  3. Crazy or eccentric

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  1. Out of one's mind; crazy:
  2. Wildly enthusiastic, excited, etc.
  3. Crazy or eccentric

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• batty

  1. Mentally deranged; crazy.
  2. (Slang) Crazy or eccentric

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  1. Mentally deranged; crazy.
  2. (Slang) Crazy or eccentric

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• cuckoo

  1. Lacking in sense; foolish or crazy.
  2. (Slang) Crazy; foolish; silly

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  1. Lacking in sense; foolish or crazy.
  2. (Slang) Crazy; foolish; silly

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• fruity

  1. Rich or mellow in tone, esp. excessively so
  2. Like fruit in taste or smell
  3. (Slang) Crazy; eccentric.

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  1. Rich or mellow in tone, esp. excessively so
  2. Like fruit in taste or smell
  3. (Slang) Crazy; eccentric.

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• loco

  1. (Western US) intoxicated by eating locoweed
  2. Mentally deranged; crazy.
  3. (Slang) Crazy; demented

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  1. (Western US) intoxicated by eating locoweed
  2. Mentally deranged; crazy.
  3. (Slang) Crazy; demented

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• nuts

  1. Extremely enthusiastic:
  2. Crazy or foolish.

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  1. Extremely enthusiastic:
  2. Crazy or foolish.

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• nutty

  1. (Slang) Enthusiastic, often to excess
  2. Having a flavor like that of nuts:
  3. Odd, foolish, crazy, etc.

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  1. (Slang) Enthusiastic, often to excess
  2. Having a flavor like that of nuts:
  3. Odd, foolish, crazy, etc.

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• screwy

  1. Ludicrously odd, unlikely, or inappropriate.
  2. Mentally unbalanced; crazy
  3. Eccentric or crazy.

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  1. Ludicrously odd, unlikely, or inappropriate.
  2. Mentally unbalanced; crazy
  3. Eccentric or crazy.

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• wacky

  1. (Slang) Erratic, eccentric, or irrational; zany
  2. Eccentric or irrational:
  3. Crazy; silly:

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  1. (Slang) Erratic, eccentric, or irrational; zany
  2. Eccentric or irrational:
  3. Crazy; silly:

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• crackers

  1. (Chiefly Brit., Slang) Crazy; insane

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  1. (Chiefly Brit., Slang) Crazy; insane

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• non compos mentis

  1. Mentally incompetent. Mentally incompetent.
  2. Not of sound mind and hence not legally competent.

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  1. Mentally incompetent. Mentally incompetent.
  2. Not of sound mind and hence not legally competent.

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