80 entries under reasonable topic. ×

2
lucid(sound, sensible, reasoning, intellectual)
2
serious(adjective, keen, deep, thoughtful)
2
subjective(adjective, keen, heavy, deep)
2
thought-out(adjective, reasoning, intellectual, mental)
1
absorbed(adjective, keen, deep, rational)
1
all there(expression, sound, smart, bright)
1
analytical(adjective, sound, keen, sensible)
1
calm(adjective, sound, sensible, rational)
1
conceivable
1
cool(adjective, sound, sensible, rational)
1
deep(adjective, keen, smart, bright)
1
discerning(noun, adjective, understanding, sound)
1
discriminating(sound, sensible, reasoning, intellectual)
1
earnest(adjective, keen, deep, rational)
1
farsighted(adjective, keen, deep, rational)
1
feasible
1
grave(adjective, keen, deep, rational)
1
inductive
1
intent(noun, adjective, feeling, cause)
1
keen(adjective, smart, bright, deep)
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APASmart Define. (2016). thinking thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/thinking/thesaurus/synonyms
ChicagoSmart Define. 2016. "thinking thesaurus" https://smartdefine.org/thinking/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, thinking thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/thinking/thesaurus/synonyms>.
MLASmart Define. "thinking thesaurus" 11 February 2016. Web. 22 September 2026. <https://smartdefine.org/thinking/thesaurus/synonyms>