118 entries under significant topic. ×
| foremost(basic, prime, vital, earnest) | |
| front-page(great, big, heavy, substantial) | |
| generous(adjective, strong, solid, big, important) | |
| hairy(adjective, bad, rough, difficult, heavy) | |
| imperative(adjective, big, important, substantial) | |
| leading(adjective, good, important, powerful) | |
| marked(big, unusual, substantial, valuable) | |
| memorable(adjective, great, unusual, important, famous) | |
| mind-blowing(adjective, great, unusual, important, exceptional) | |
| observable(adjective, great, extraordinary, unusual, important) | |
| of moment(expression, big, substantial, valuable) | |
| of note(expression, big, substantial, valuable) | |
| of substance(expression, big, substantial, valuable) | |
| paramount(important, critical, basic, prime) | |
| playing hard ball(expression, adjective, idiom, great, heavy) | |
| red-letter(adjective, great, extraordinary, unusual, important) | |
| something(big, outstanding, substantial, valuable) | |
| stable(adjective, strong, solid, big, important) | |
| standout(great, extraordinary, big, substantial) | |
| sturdy(adjective, strong, hard, tough, 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> |