Synonyms of insanity in English:

insanity


See definition of insanity

noun

1‘insanity runs in her family’

SYNONYMS

mental illness, mental disorder, mental derangement, madness, insaneness, dementia, dementedness, lunacy, instability, unsoundness of mind, loss of reason

delirium, hysteria, mania, psychosis

informal craziness

archaic crazedness

rare deliration

ANTONYMS

sanity

2‘it would be pure insanity to take this loan’

SYNONYMS

folly, foolishness, foolhardiness, idiocy, stupidity, imbecility, asininity, lunacy, madness, silliness, senselessness, brainlessness, thoughtlessness, irrationality, illogicality, absurdity, ludicrousness, ridiculousness

informal craziness

British informal daftness

ANTONYMS

sense