- Definitions|2
- Thesaurus|856
- Abbreviations|0
106 entries under tough topic. ×
| recalcitrant(firm, unreasonable, grim, obstinate) | |
| rough(adjective, strong, hard, severe) | |
| sanguinary(adjective, hard, harsh, violent) | |
| shameless(adjective, hard, harsh, cruel) | |
| sour(adjective, hard, harsh, grim) | |
| thick-skinned(adjective, mean, hard, harsh) | |
| tyrannical(adjective, hard, evil, nasty) | |
| uncontrite(adjective, hard, harsh, cruel) | |
| uncooperative(adjective, mean, hard, harsh) | |
| unimpressible(adjective, mean, hard, harsh) | |
| unregenerate(adjective, hard, harsh, cruel) | |
| unrepenting(adjective, hard, harsh, cruel) | |
| unshakable(adjective, mean, hard, firm) | |
| dense(adjective, strong, hard, sturdy) | |
| ferric(adjective, strong, hard, sturdy) | |
| ferrous(adjective, strong, hard, sturdy) | |
| hard-shell(adjective, strong, hard, severe) | |
| hard as nails(expression, adjective, idiom, strong, hard) | |
| robust(adjective, strong, hard, sturdy) | |
| rock hard(expression, adjective, strong, hard) |
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| APA | Smart Define. (2016). implacable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/implacable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "implacable thesaurus" https://smartdefine.org/implacable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, implacable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/implacable/thesaurus/synonyms>. |
| MLA | Smart Define. "implacable thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/implacable/thesaurus/synonyms> |