918 entries under adjective topic. ×
| laborious(hard, easy, difficult, important) | |
| sedate(calm, dull, cool, severe) | |
| painful(bad, hard, difficult, offensive) | |
| staid(calm, dull, set, cool) | |
| dire(hard, difficult, complex) | |
| heavyweight(hard, difficult, important, complex) | |
| operose(hard, difficult, important, complex) | |
| precarious(hard, difficult, complex, dangerous) | |
| grim(dull, strong, hard, tough) | |
| heartrending(hard, difficult, complex) | |
| involved(hard, difficult, complex, awkward) | |
| massive(hard, difficult, complex) | |
| oppressive(hard, difficult, complex) | |
| sore(hard, difficult, complex) | |
| stubborn(strong, hard, tough, firm) | |
| troubled(hard, difficult, unhappy, gloomy) | |
| backbreaking(hard, difficult, complex, awkward) | |
| burdensome(hard, difficult, big, heavy) | |
| complicated(hard, difficult, complex, awkward) | |
| cruel(strong, hard, tough, severe) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 25 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |