- Definitions|2
- Thesaurus|1.3k
- Abbreviations|0
137 entries under tough topic. ×
| flinty(adjective, close, strong, hard) | |
| hard-shell(adjective, strong, hard, severe) | |
| hardened(adjective, hard, harsh, cold) | |
| pigheaded(adjective, mean, hard, determined) | |
| staunch(adjective, strong, firm, determined) | |
| serious(adjective, close, strong, hard) | |
| barbarous(adjective, animal, appearance, mean, strong) | |
| cussed(adjective, severe, firm, unreasonable) | |
| forbidding(adjective, appearance, strong, hard) | |
| hard-line(adjective, strong, hard, firm) | |
| persisting(adjective, strong, firm, determined) | |
| perverse(adjective, mean, hard, determined) | |
| true(adjective, strong, firm, determined) | |
| tyrannical(adjective, hard, evil, nasty) | |
| unregenerate(adjective, hard, harsh, cruel) | |
| vindictive(adjective, mean, hard, severe) | |
| astringent(adjective, close, strong, hard) | |
| authoritarian(adjective, strong, hard, severe) | |
| cantankerous(firm, persistent, obstinate, stubborn) | |
| contumacious(firm, persistent, obstinate, stubborn) |
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| APA | Smart Define. (2015). relentless thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/relentless/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "relentless thesaurus" https://smartdefine.org/relentless/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, relentless thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/relentless/thesaurus/synonyms>. |
| MLA | Smart Define. "relentless thesaurus" 24 June 2015. Web. 29 September 2026. <https://smartdefine.org/relentless/thesaurus/synonyms> |