127 entries under tough topic. ×
| tiring(adjective, severe, rough, difficult) | |
| troublesome(adjective, hard, severe, rough) | |
| unaffected(adjective, open, honest, true) | |
| unembellished(adjective, rational, straightforward, sober) | |
| unidealistic(adjective, rational, straightforward, sober) | |
| unimaginative(adjective, rational, straightforward, sober) | |
| unimpassioned(adjective, calm, dark, restrained) | |
| unrelenting(adjective, close, strong, hard) | |
| unsentimental(adjective, rational, straightforward, sober) | |
| unsparing(adjective, close, strong, hard) | |
| unvarnished(adjective, rational, straightforward, sober) | |
| uphill battle(expression, adjective, rough, difficult) | |
| wearing(adjective, hard, rough, difficult) | |
| wearisome(adjective, hard, severe, rough) | |
| wearying(adjective, rough, difficult, heavy) | |
| adamant(adjective, strong, hard, firm) | |
| adamantine(adjective, strong, hard, sturdy) | |
| dense(adjective, strong, hard, big) | |
| ferric(adjective, strong, hard, sturdy) | |
| ferrous(adjective, strong, hard, sturdy) |
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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> |