918 entries under adjective topic. ×
| trying(hard, difficult, complex) | |
| unbearable(hard, difficult, complex) | |
| substantial(importance, big, heavy, important) | |
| pressing(hard, tough, difficult, big) | |
| dangerous(help, bad, great, severe) | |
| crucial(great, severe, extraordinary, big) | |
| grand(importance, valuable, main, greatness) | |
| great(importance, valuable, main, notable) | |
| meaningful(good, great, severe, extraordinary) | |
| sincere(noun, open, keen, warm) | |
| acute(severe, harsh, heavy, important) | |
| big(good, importance, heavy, important) | |
| urgent(hard, tough, severe, difficult) | |
| material(good, importance, big, heavy) | |
| portentous(importance, valuable, main, notable) | |
| considerable(importance, big, heavy, important) | |
| key(importance, important, valuable, main) | |
| sombre | |
| deep(keen, important, significant, thoughtful) | |
| essential(severe, importance, big, important) |
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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> |