127 entries under tough topic. ×
| severe(adjective, calm, help, bad, strong) | |
| weighty(adjective, good, dull, hard, great) | |
| critical(adjective, hard, great, severe) | |
| sober(adjective, calm, dull, quiet, cool) | |
| difficult(adjective, hard, easy, harsh) | |
| grievous(adjective, help, hard, great) | |
| hard(adjective, strong, easy, severe) | |
| arduous(adjective, hard, easy, difficult) | |
| grim(adjective, dull, strong, hard) | |
| stubborn(adjective, strong, hard, firm) | |
| cruel(adjective, strong, hard, severe) | |
| hard-nosed(adjective, strong, hard, severe) | |
| heavy(adjective, strong, hard, great) | |
| rough(adjective, bad, strong, hard) | |
| rugged(adjective, strong, hard, difficult) | |
| pressing(adjective, hard, difficult, big) | |
| urgent(adjective, hard, severe, difficult) | |
| challenging(adjective, hard, difficult, importance) | |
| austere(adjective, set, strong, hard) | |
| calm(adjective, cool, sensible, relaxed) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 28 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |