918 entries under adjective topic. ×
| deliberate(calm, set, cool, severe) | |
| demure(calm, cool, modest, shy) | |
| formidable(bad, hard, difficult, unpleasant) | |
| heartfelt(open, keen, warm, honest) | |
| hearty(complete, keen, warm, total) | |
| integral(importance, main, extremely significant) | |
| life-threatening | |
| menacing(bad, nasty, unpleasant, heavy) | |
| noble(importance, important, significant, grand) | |
| pivotal | |
| reflective(set, deep, thoughtful, sober) | |
| resolved(severe, firm, harsh, cruel) | |
| threatening(bad, severe, unpleasant, heavy) | |
| ugly(bad, nasty, offensive, unpleasant) | |
| wholehearted(open, keen, warm, honest) | |
| zealous(keen, warm, total, intense) | |
| calm(cool, tough, sensible, relaxed) | |
| devout(open, keen, warm, honest) | |
| distressing(tough, severe, rough, difficult) | |
| funereal(dull, dark, gloomy, sober) |
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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> |