- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
171 entries under tough topic. ×
| unpermissive(adjective, hard, severe, rough) | |
| unpleasant(adjective, severe, harsh, cruel) | |
| unregenerate(adjective, hard, harsh, cruel) | |
| unremitting(adjective, hard, harsh, cruel) | |
| unrepenting(adjective, hard, harsh, cruel) | |
| uphill battle(expression, adjective, rough, difficult) | |
| uptight(adjective, severe, firm, harsh) | |
| vengeful(adjective, harsh, grim, painful) | |
| vindictive(adjective, hard, harsh, cruel) | |
| wearing(adjective, rough, difficult, heavy) | |
| wearying(adjective, rough, difficult, heavy) | |
| bothersome(adjective, rough, difficult, heavy) | |
| cold-blooded(adjective, harsh, grim, painful) | |
| cold fish(expression, adjective, harsh, grim) | |
| dense(adjective, strong, hard, sturdy) | |
| ferric(adjective, strong, hard, sturdy) | |
| ferrous(adjective, strong, hard, sturdy) | |
| hard as nails(expression, adjective, idiom, severe) | |
| herculean(adjective, rough, difficult, heavy) | |
| insensible(adjective, strong, hard, sturdy) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |