6
born yesterday(adjective, new)
6
impressionable(adjective, person, easy, feelings, ready)
6
inexperienced(adjective, simple, silly, stupid, innocent)
6
soft(adjective, calm, light, easy, informal)
6
stupid(adjective, dull, simple, slow, silly)
5
easily taken in(expression, adjective, idiom, innocent, susceptible)
5
trusting(adjective, calm, person, light, simple)
5
immature
5
persuadable(adjective, person, easy, feelings, ready)
4
childlike(adjective, simple, innocent, ignorant, naive)
4
confiding(simple, fresh, innocent, ignorant, childlike)
4
ignorant(adjective, simple, silly, stupid, innocent)
4
mark(adjective, easy, informal, ready, subject)
4
sensitive(adjective, easy, ready, subject, affected)
4
simple-minded(adjective, simple, silly, stupid, fresh)
4
suggestible(adjective, person, easy, feelings, ready)
4
uncritical
3
callow(adjective, simple, fresh, raw, innocent)
3
easy mark(expression, adjective, innocent, green, susceptible)
3
guileless(adjective, simple, innocent, ignorant, naive)
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APASmart Define. (2016). gullible thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/gullible/thesaurus/synonyms
ChicagoSmart Define. 2016. "gullible thesaurus" https://smartdefine.org/gullible/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, gullible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/gullible/thesaurus/synonyms>.
MLASmart Define. "gullible thesaurus" 23 March 2016. Web. 25 September 2026. <https://smartdefine.org/gullible/thesaurus/synonyms>