115 entries under heavy topic. ×
| acute(adjective, severe, harsh, important) | |
| big(adjective, good, importance, important) | |
| urgent(adjective, hard, tough, severe, difficult) | |
| material(adjective, good, importance, big) | |
| considerable(adjective, importance, big, important) | |
| notable(adjective, great, extraordinary, importance, unusual) | |
| major(adjective, great, unpleasant, important) | |
| intense(adjective, severe, keen, warm, sensible) | |
| no-nonsense(adjective, calm, dull, work, open) | |
| bad(adjective, severe, nasty, offensive, unhappy) | |
| somber(adjective, calm, dull, cool, severe) | |
| perilous(adjective, bad, uncertain, significant) | |
| businesslike(adjective, work, somber, efficient) | |
| formidable(adjective, bad, hard, difficult, unpleasant) | |
| menacing(adjective, bad, nasty, unpleasant) | |
| threatening(adjective, bad, severe, unpleasant) | |
| ugly(adjective, bad, nasty, offensive, unpleasant) | |
| distressing(adjective, tough, severe, rough, difficult) | |
| life-and-death(adjective, important, critical, vital) | |
| strenuous(adjective, hard, severe, rough, difficult) |
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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> |