- Definitions|2
- Thesaurus|1.3k
- Abbreviations|0
178 entries under tough topic. ×
| adamantine(adjective, strong, hard, resist) | |
| dogged(adjective, strong, firm, harsh) | |
| mulish(adjective, strong, hard, firm) | |
| hardened(adjective, person, hard, severe) | |
| callous(adjective, person, mean, hard, cool) | |
| grim(adjective, mean, strong, hard) | |
| implacable(adjective, mean, strong, hard) | |
| intractable(adjective, firm, difficult, violent) | |
| severe(adjective, mean, strong, hard) | |
| perverse(adjective, mean, firm, harsh) | |
| stern(adjective, mean, hard, severe) | |
| unfeeling(adjective, mean, hard, cool) | |
| headstrong(adjective, hard, rough, harsh) | |
| stiff-necked(adjective, strong, hard, severe) | |
| hard-boiled(adjective, person, strong, hard) | |
| hard-hearted(adjective, mean, hard, severe) | |
| harsh(adjective, mean, strong, hard, cool) | |
| iron(adjective, strong, hard, firm) | |
| pigheaded(adjective, determined, resolute, obstinate) | |
| remorseless(adjective, mean, harsh, resist) |
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| APA | Smart Define. (2016). obdurate thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/obdurate/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "obdurate thesaurus" https://smartdefine.org/obdurate/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, obdurate thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/obdurate/thesaurus/synonyms>. |
| MLA | Smart Define. "obdurate thesaurus" 23 March 2016. Web. 29 September 2026. <https://smartdefine.org/obdurate/thesaurus/synonyms> |