Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Thesaurus

insanity

noun

Synonyms and Antonyms of insanity

  1. 1 a serious mental disorder that prevents one from living a safe and normal life <his incurable insanity requires that he spend the rest of his life in a mental hospital> Synonyms aberration, dementia, derangement, lunacy, madness, mania, rage [archaic] Related Words neurosis, psychosis; instability, irrationality, unreasonableness; delirium, frenzy, hysteria; hallucinosis, hypomania, paranoia, schizophrenia; senile dementia; delusion, hallucination; monomania, obsession, phobia; abnormality, dementedness, unsoundness Near Antonyms lucidity, rationality, rationalness, reasonability, reasonableness; normality, soundness Antonyms mind, saneness, sanity

  2. 2 a foolish act or idea <everyone laughed at the latest insanity from the town eccentric> Synonyms absurdity, asininity, bêtise, fatuity, foolery, foppery, idiocy, imbecility, inanity, folly, lunacy, stupidityRelated Words absurdness, craziness, foolishness, inaneness, madness, senselessness, witlessness; buffoonery, monkeyshine(s), shenanigan(s), tomfoolery; drivel, humbug, nonsense, twaddle; blunder, bungle, flub, goof, howlerNear Antonyms discretion, forethought, prudence, sagacity, wisdom; brainstorm, inspiration

  3. 3 lack of good sense or judgment <had the insanity to think that taking over a government building in protest of our foreign policy was a good idea> Synonyms absurdity, asininity, balminess, brainlessness, craziness, daftness, dippiness, dottiness, fatuity, fatuousness, folly, imbecility, inanity, foolishness, lunacy, madness, nonsensicalness, nuttiness, preposterousness, senselessness, silliness, simplicity, unwisdom, wackiness, witlessness, zaninessRelated Words denseness, dim-wittedness, doltishness, dopiness, dullness (also dulness), dumbness, feeblemindedness, gormlessness [chiefly British], idiocy, mindlessness, oafishness, obtuseness, simplemindedness, simpleness, slowness, stupidity, stupidness, vacuity; fallacy, irrationality, unreasonableness; kookiness, weirdness; laughableness, ludicrousness, ridiculousnessNear Antonyms logicality, logicalness, rationality, rationalness, reasonability, reasonableness, validity; discernment, insight, perception, percipienceAntonyms prudence, sagaciousness, sagacity, sageness, sanity, sapience, sensibleness, soundness, wisdom





Seen and Heard

What made you want to look up insanity? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 5, 2016

bread traditionally eaten on Shabbat

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

duvet pince-nez kittly-benders spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ