85 entries under reflective topic. ×

1
brainy(adjective, reasonable, keen, sensible, deep)
1
calculating(adjective, reasonable, keen, deep, rational)
1
cerebral(adjective, reasonable, keen, deep, rational)
1
discerning(adjective, reasonable, keen, sensible, heavy)
1
eager(adjective, keen, warm, intense, passionate)
1
engrossed(adjective, reasonable, keen, deep, rational)
1
farsighted(adjective, reasonable, keen, deep, rational)
1
learned(deep, thoughtful, cultured)
1
levelheaded(adjective, calm, reasonable, sensible, dark)
1
logical(adjective, reasonable, keen, sensible, deep)
1
lost in thought(expression, adjective, idiom, reasonable, thoughtful)
1
mysterious(deep, thoughtful)
1
philosophic(adjective, reasonable, keen, deep, rational)
1
philosophical(deep, thoughtful, grand, esteemed)
1
rapt(adjective, reasonable, keen, deep, rational)
1
reasoning(adjective, reasonable, keen, deep, rational)
1
retrospective(adjective, reasonable, keen, deep, rational)
1
studious(adjective, reasonable, keen, deep, thoughtful)
1
subjective(adjective, reasonable, keen, deep, rational)
1
wise(adjective, reasonable, keen, heavy, deep)
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APASmart Define. (2016). serious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 27 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>