97 entries under thoughtful topic. ×
| attentive(adjective, reasonable, keen, deep) | |
| brooding(adjective, sober, thinking, grave) | |
| deadpan(adjective, set, tough, severe, honest) | |
| erudite(deep, cultured, reflective) | |
| intellectual(adjective, reasonable, keen, deep) | |
| pondering(adjective, reasonable, keen, deep) | |
| preoccupied(adjective, reasonable, keen, deep) | |
| recondite(intense, heavy, deep, fierce) | |
| reflecting(adjective, reasonable, keen, deep, rational) | |
| ruminating(thinking, meditative) | |
| sage(deep, grand, esteemed, reflective) | |
| scholarly(deep, cultured, reflective) | |
| shrewd(deep, reflective) | |
| speculative(bad, heavy, thinking, risky) | |
| thinking(adjective, reasonable, keen, deep) | |
| absorbed(adjective, reasonable, keen, deep) | |
| brainy(adjective, reasonable, keen, sensible, deep) | |
| cold sober(expression, adjective, calm, set, cool) | |
| discerning(adjective, reasonable, keen, sensible, heavy) | |
| eager(adjective, keen, warm, intense, passionate) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 28 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |