74 entries under reasonable topic. ×

3
keen(adjective, smart, bright, deep)
3
perspicacious(adjective, sound, smart, bright)
3
sound(adjective, sensible, deep, knowledgeable)
2
calculating(adjective, keen, smart, bright)
2
cogitative(adjective, keen, deep, rational)
2
contemplative(adjective, keen, deep, rational)
2
deductive(sound, sensible, reasoning, mental)
2
discerning(adjective, sound, smart, bright)
2
judicious(sound, sensible, knowledgeable, cultured)
2
logical(adjective, good, sound, sensible)
2
meditative(adjective, keen, deep, rational)
2
pensive(adjective, keen, deep, rational)
2
ratiocinative(adjective, sound, sensible, reasoning)
2
serious(adjective, keen, deep, thoughtful)
2
sober(adjective, good, sound, keen)
1
absorbed(adjective, keen, deep, rational)
1
all there(expression, sound, smart, bright)
1
attentive(thoughtful, serious, pensive, reflective)
1
cool(sound, sensible, reasoning, mental)
1
deliberative(adjective, keen, deep, rational)
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APASmart Define. (2016). intellectual thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/intellectual/thesaurus/synonyms
ChicagoSmart Define. 2016. "intellectual thesaurus" https://smartdefine.org/intellectual/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, intellectual thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/intellectual/thesaurus/synonyms>.
MLASmart Define. "intellectual thesaurus" 22 February 2016. Web. 26 September 2026. <https://smartdefine.org/intellectual/thesaurus/synonyms>