74 entries under reasonable topic. ×

20
cerebral(adjective, sound, smart, sensible)
20
intelligent(adjective, sound, ability, smart)
18
rational(adjective, good, sound, smart)
15
brainy(adjective, ability, smart, bright)
9
thoughtful(adjective, good, sound, smart)
9
wise(adjective, good, sound, smart)
7
subjective(adjective, keen, smart, rational)
7
thinking(adjective, sound, keen, smart)
6
knowing(adjective, sound, ability, smart)
6
philosophic(adjective, sound, sensible, rational)
6
reasoning(noun, adjective, power, sound)
5
ruminative(adjective, rational, intelligent, thoughtful)
5
sagacious(adjective, sound, smart, bright)
4
deep(adjective, good, sound, smart)
4
reflective(adjective, sound, sensible, deep)
4
sane(sound, sensible, reasoning, mental)
4
sensible(adjective, good, sound, smart)
4
studious(adjective, smart, rational, intelligent)
3
analytical(adjective, sound, sensible, rational)
3
cognitive(adjective, sound, sensible, rational)
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APASmart Define. (2016). intellectual thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/intellectual/thesaurus/synonyms
ChicagoSmart Define. 2016. "intellectual thesaurus" https://smartdefine.org/intellectual/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, intellectual thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/intellectual/thesaurus/synonyms>.
MLASmart Define. "intellectual thesaurus" 22 February 2016. Web. 23 September 2026. <https://smartdefine.org/intellectual/thesaurus/synonyms>