918 entries under adjective topic. ×
| grave(calm, dull, quiet, help) | |
| severe(calm, help, bad, strong) | |
| weighty(good, dull, hard, great) | |
| solemn(calm, dull, quiet, cool) | |
| important(good, great, severe, extraordinary) | |
| earnest(noun, calm, dull, work) | |
| critical(hard, great, tough, severe) | |
| significant(good, great, extraordinary, importance) | |
| sad(hard, difficult, complex, importance) | |
| sober(calm, dull, quiet, cool) | |
| difficult(hard, tough, easy, harsh) | |
| grievous(help, hard, great, tough) | |
| momentous(good, great, severe, extraordinary) | |
| consequential(good, harsh, importance, big) | |
| tough(bad, strong, hard, easy) | |
| ambitious(hard, difficult, importance, complex) | |
| hard(strong, tough, easy, severe) | |
| profound(hard, difficult, complex, deep) | |
| arduous(hard, tough, easy, difficult) | |
| nasty(bad, hard, difficult, offensive) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 23 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |