Synonyms|460Antonyms|2|Broader|11Narrower|0Related|276
12
crazy(noun, informal, wise, fanatic, crackpot)
11
insane
10
fool(noun, person, simple, fool, stupid)
8
idiot(noun, simple, fool, innocent, jerk)
8
nut(noun, slang, informal, mad, sick)
7
clod(noun, simple, fool, innocent, jerk)
7
crackpot(noun, fool, crazy, mad, wise)
7
loony(noun, slang, informal, sick, wise)
6
birdbrain(noun, simple, fool, innocent, jerk)
6
dullard(noun, fool)
6
dunce(noun, simple, fool, innocent, jerk)
6
lunatic(noun, person, mad, wise, crackpot)
6
screwball(noun, slang, sick, wise, mad person)
5
cuckoo(noun, slang, mad, sick, wise)
5
kook(noun, slang, mad, sick, wise)
5
diver
5
dolt(noun, simple, fool, innocent, jerk)
5
dope(noun, simple, fool, innocent, jerk)
5
maniac(noun, person, crazy, mad, patient)
5
nincompoop(noun, simple, fool, innocent, jerk)
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APASmart Define. (2016). loon thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/loon/thesaurus/synonyms
ChicagoSmart Define. 2016. "loon thesaurus" https://smartdefine.org/loon/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, loon thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/loon/thesaurus/synonyms>.
MLASmart Define. "loon thesaurus" 29 February 2016. Web. 21 September 2026. <https://smartdefine.org/loon/thesaurus/synonyms>