118 entries under significant topic. ×
| relevant(adjective, importance, big, substantial) | |
| formidable(adjective, bad, hard, difficult, unpleasant) | |
| menacing(adjective, bad, nasty, unpleasant, heavy) | |
| noble(adjective, importance, important, grand) | |
| threatening(adjective, bad, severe, unpleasant, heavy) | |
| ugly(adjective, bad, nasty, offensive, unpleasant) | |
| main(basic, prime, vital, imperative) | |
| strenuous(adjective, hard, severe, rough, difficult) | |
| distinguished(adjective, great, unusual, important, famous) | |
| fell(adjective, unpleasant, heavy, important) | |
| firm(adjective, strong, hard, tough, severe) | |
| hot(adjective, great, keen, warm, intense) | |
| strong(adjective, hard, tough, firm, solid) | |
| capital(adjective, severe, important, critical) | |
| central(adjective, important, basic, prime) | |
| goodly(large, greatness, considerable) | |
| major-league(adjective, great, extraordinary, unusual, important) | |
| powerful(adjective, good, important, prominent) | |
| prominent(adjective, good, great, unusual, important) | |
| sound(adjective, calm, strong, honest, solid) |
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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> |