Synonyms|686Antonyms|62|Broader|11Narrower|9Related|1.8k

51 entries under idiom topic. ×

7
mentally ill(expression, adjective, sane, unwell)
6
not all there(noun, expression, adjective, slang)
6
of unsound mind(expression, adjective, silly, mad)
5
out to lunch(expression, adjective, silly, mad)
5
round the bend(expression, silly, foolish, mad)
2
around the bend(expression, adjective, confused, insane)
2
bats in the belfry(expression, silly, foolish, mad)
2
mad as a March hare(expression, silly, foolish, mad)
2
mad as a hatter(expression, adjective, silly, foolish)
2
nutty as fruitcake(expression, silly, foolish, mad)
2
off one's rocker(adjective, sane)
1
crazy as a loon(expression, adjective, crazy, confused)
1
just plain nuts
1
mocking bird(expression, imitation)
1
off the hinges
1
off the track
1
off the wall
1
out of one's mind(adjective, irrational, sane)
1
stark raving mad(adjective, sane)
0
Common Cuckoo
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APASmart Define. (2016). cuckoo thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/cuckoo/thesaurus/synonyms
ChicagoSmart Define. 2016. "cuckoo thesaurus" https://smartdefine.org/cuckoo/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, cuckoo thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/cuckoo/thesaurus/synonyms>.
MLASmart Define. "cuckoo thesaurus" 30 March 2016. Web. 24 September 2026. <https://smartdefine.org/cuckoo/thesaurus/synonyms>