127 entries under tough topic. ×
| labored(adjective, hard, severe, rough) | |
| lifeless(adjective, rational, straightforward, sober) | |
| mean(adjective, rough, difficult, unpleasant) | |
| merciless(adjective, severe, rough, difficult) | |
| mortified(adjective, strong, hard, severe) | |
| mulish(adjective, strong, hard, severe) | |
| mundane(adjective, rational, straightforward, sober) | |
| naked(adjective, rational, straightforward, sober) | |
| obdurate(adjective, close, strong, hard) | |
| objective(adjective, rational, straightforward, sober) | |
| phlegmatic(adjective, rational, straightforward, sober) | |
| plain(adjective, calm, open, honest) | |
| pragmatic(adjective, rational, straightforward, sober) | |
| prosaic(adjective, rational, straightforward, sober) | |
| prosy(adjective, rational, straightforward, sober) | |
| scabrous(adjective, rough, difficult, heavy) | |
| slavish(adjective, rough, difficult, heavy) | |
| stiff-necked(adjective, strong, hard, severe) | |
| stoic(adjective, rational, straightforward, sober) | |
| sturdy(adjective, strong, hard, solid) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 30 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |