97 entries under thoughtful topic. ×

1
engrossed(adjective, reasonable, keen, deep, rational)
1
learned(deep, cultured, reflective)
1
lost in thought(expression, adjective, idiom, reasonable)
1
mysterious(deep, reflective)
1
philosophical(deep, grand, esteemed, reflective)
1
rapt(adjective, reasonable, keen, deep, rational)
1
reasoning(adjective, reasonable, keen, deep, rational)
1
studious(adjective, reasonable, keen, deep)
1
wise(adjective, reasonable, keen, heavy, deep)
0
occult(deep, reflective)
0
abstracted(thinking, meditative)
0
academic(cultured, reflective)
0
acroamatic(deep, reflective)
0
bookish(cultured, reflective)
0
cogitating
0
dreamy(thinking, meditative)
0
enlightened(deep, reflective)
0
grubbing
0
hard-working
0
hermetic(deep, reflective)
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APASmart Define. (2016). serious thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 29 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>