Synonyms|503Antonyms|100|Broader|13Narrower|17Related|1.6k

49 entries under idiom topic. ×

12
non compos mentis(expression, adjective, law, foolish)
11
of unsound mind(expression, adjective, silly, mad)
8
mentally ill(expression, adjective, mad, insane)
8
not all there(expression, adjective, unstable, disturbed)
6
out to lunch(expression, adjective, silly, mad)
3
insane person(noun, expression, person, worrier)
3
off one's head(expression, adjective, crazy, mad)
3
off one's rocker(adjective, sane)
2
around the bend(expression, adjective, wrong, confused)
2
bats in the belfry(expression, silly, foolish, mad)
2
bereft of reason(expression, insanity)
2
crazy person(noun, expression, person)
2
mad as a March hare(expression, silly, foolish, mad)
2
mad as a hatter(expression, adjective, silly, foolish)
2
mentally deranged
2
not right(expression, insanity)
2
nutty as fruitcake(expression, silly, foolish, mad)
2
round the bend(expression, silly, foolish, mad)
1
crazy as a loon(expression, adjective, crazy, confused)
1
deprived of reason
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ChicagoSmart Define. 2015. "lunatic thesaurus" https://smartdefine.org/lunatic/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, lunatic thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/lunatic/thesaurus/synonyms>.
MLASmart Define. "lunatic thesaurus" 6 August 2015. Web. 26 September 2026. <https://smartdefine.org/lunatic/thesaurus/synonyms>