127 entries under tough topic. ×
| effortful(adjective, hard, severe, rough) | |
| emotionless(adjective, rational, straightforward, sober) | |
| exacting(adjective, hard, severe, rough) | |
| exhausting(adjective, hard, severe, rough) | |
| exigent(adjective, hard, difficult, big) | |
| factual(adjective, rational, straightforward, sober) | |
| fatiguing(adjective, severe, rough, difficult) | |
| feasible(adjective, rational, straightforward, sober) | |
| flat(adjective, rational, straightforward, sober) | |
| flinty(adjective, close, strong, hard) | |
| hang-tough(adjective, strong, hard, severe) | |
| hard-boiled(adjective, calm, strong, hard) | |
| hard-core(adjective, strong, hard, severe) | |
| hard-line(adjective, strong, hard, severe) | |
| hard-shell(adjective, strong, hard, severe) | |
| hardheaded(adjective, strong, hard, severe) | |
| impersonal(adjective, rational, straightforward, sober) | |
| importunate(hard, big, important, substantial) | |
| inflexible(adjective, strong, hard, severe) | |
| irksome(adjective, severe, rough, difficult) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 29 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |