918 entries under adjective topic. ×
| gloomy(dull, unhappy, dark, unpleasant) | |
| life-and-death(heavy, important, critical, vital) | |
| loyal | |
| noteworthy(important, outstanding, prominent, remarkable) | |
| parlous | |
| passionate(complete, keen, warm, total) | |
| saturnine(severe, unpleasant, horrible, disagreeable) | |
| strenuous(hard, severe, rough, difficult) | |
| contemplative(reasonable, thoughtful, sober, thinking) | |
| burning(keen, warm, intense, passionate) | |
| classical | |
| collected(calm, cool, dark, relaxed) | |
| cool(calm, sensible, unusual, relaxed) | |
| decided(strong, firm, determined, resolute) | |
| distinguished(great, unusual, important, famous) | |
| drab(calm, dull, sensible, dark) | |
| estimable(honest, pure, straight, grand) | |
| extreme | |
| faithful(open, firm, honest, true) | |
| fatal |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |