Synonyms of lunacy in English:

lunacy


See US English definition of lunacy

See UK English definition of lunacy

See Spanish definition of locura

noun

1‘the survivors descended into despair and lunacy’

SYNONYMS
insanity, madness, mental illness, derangement, dementia, dementedness, insaneness, loss of reason, unsoundness of mind, mental instability, mania, frenzy, psychosis
informal craziness
ANTONYMS

sanity

2‘such an economic policy would be sheer lunacy’

SYNONYMS
folly, foolishness, foolhardiness, stupidity, idiocy, imbecility, irrationality, illogicality, senselessness, nonsense, absurdity, absurdness, madness, insanity
silliness, inanity, ridiculousness, ludicrousness
informal craziness
British informal daftness
ANTONYMS

sense, prudence