The definition of insanity is having a serious mental illness or being extremely foolish.
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.
An excessive, persistent enthusiasm, liking, craving, or interest; obsession; craze
A fanciful building built for purely ornamental reasons.
Behavior like that of an idiot; great foolishness or stupidity
The quality of being inept; ineptness.
(Countable) An act that is stupid.
Soundness of judgment or reason.
The definition of a disturbance is an interruption of what should be going on, or a bothersome intrusion.
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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(Countable) A mental disorder.
Mental illness. No longer in clinical use.
The condition of being unbalanced; imbalance
Mental derangement; insanity
Foolish behavior or a foolish action
Something, such as an act or suggestion, that is considered stupid or foolish.
Extravagant foolishness or frivolity:
The condition of having a sound and rational mind; being mentally healthy and having the ability to distinguish right from wrong. In all jurisdictions, being sane is presumed, and it is up to the defense to prove the contrary to be true. Synonymous with sanity. See also insanity and insanity defense.
Find another word for lunacy. In this page you can discover 33 synonyms, antonyms, idiomatic expressions, and related words for lunacy, like: craziness, ability, insanity, madness, dementia, mania, absurdity, derangement, folly, foolishness and idiocy.