Synonyms of insanity in English:

insanity


See US English definition of insanity

See UK English definition of insanity

See Spanish definition of demencia

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