93 entries under difficult topic. ×
| grave(adjective, calm, dull, quiet, help) | |
| severe(adjective, calm, help, bad, strong) | |
| weighty(adjective, good, dull, hard, great) | |
| solemn(adjective, calm, dull, quiet, cool) | |
| critical(adjective, hard, great, tough, severe) | |
| sad(adjective, hard, complex, importance) | |
| grievous(adjective, help, hard, great, tough) | |
| tough(adjective, bad, strong, hard, easy) | |
| ambitious(adjective, hard, importance, complex) | |
| hard(adjective, strong, tough, easy, severe) | |
| profound(adjective, hard, complex, deep) | |
| arduous(adjective, hard, tough, easy) | |
| nasty(adjective, bad, hard, offensive) | |
| laborious(adjective, hard, easy, important) | |
| painful(adjective, bad, hard, offensive) | |
| dire(adjective, hard, complex) | |
| heavyweight(adjective, hard, important, complex) | |
| operose(adjective, hard, important, complex) | |
| precarious(adjective, hard, complex, dangerous) | |
| heartrending(adjective, hard, complex) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 20 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |