74 entries under reasonable topic. ×

1
earnest(adjective, keen, deep, rational)
1
engrossed(adjective, keen, deep, rational)
1
enlightened(sound, smart, bright, sensible)
1
farsighted(adjective, keen, deep, rational)
1
grave(adjective, sound, keen, sober)
1
impartial(sound, sensible, reasoning, mental)
1
intent(adjective, keen, deep, rational)
1
levelheaded(adjective, good, sound, sensible)
1
lost in thought(expression, adjective, idiom, sober)
1
melancholy(adjective, keen, deep, rational)
1
museful(adjective, keen, deep, rational)
1
musing(adjective, keen, deep, rational)
1
normal(sound, sensible, reasoning, mental)
1
objective(sound, sensible, reasoning, mental)
1
pondering(adjective, keen, deep, rational)
1
preoccupied(adjective, keen, deep, rational)
1
prudent(sound, sensible, reasoning, mental)
1
rapt(adjective, keen, deep, rational)
1
reflecting(adjective, keen, deep, rational)
1
retrospective(adjective, keen, deep, rational)
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APASmart Define. (2016). intellectual thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/intellectual/thesaurus/synonyms
ChicagoSmart Define. 2016. "intellectual thesaurus" https://smartdefine.org/intellectual/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, intellectual thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/intellectual/thesaurus/synonyms>.
MLASmart Define. "intellectual thesaurus" 22 February 2016. Web. 25 September 2026. <https://smartdefine.org/intellectual/thesaurus/synonyms>