Synonyms|387Antonyms|77|Broader|1Narrower|9Related|620
22
skeptical
21
wary
14
suspicious(adjective, discerning)
10
clear-sighted
9
doubting
9
untrusting(adjective, discerning)
7
smart
6
astute(adjective, discerning)
5
shrewd
4
discerning
4
distrustful
4
wise(adjective, discerning)
4
knowledgeable(adjective, discerning)
4
unbelieving(adjective, discerning)
3
incredulous
3
mistrustful
3
cunning(adjective, devious)
2
canny
1
declining
1
formed
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APASmart Define. (2016). gullible thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/gullible/thesaurus/antonyms
ChicagoSmart Define. 2016. "gullible thesaurus" https://smartdefine.org/gullible/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, gullible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/gullible/thesaurus/antonyms>.
MLASmart Define. "gullible thesaurus" 23 March 2016. Web. 25 September 2026. <https://smartdefine.org/gullible/thesaurus/antonyms>