125 entries under obstinate topic. ×
| arbitrary(adjective, rough) | |
| confirmed(adjective, rough) | |
| contrary(adjective, difficult, determined, resolute) | |
| drastic(adjective, hard, rough, harsh, rude) | |
| hardheaded(adjective, strong, hard, determined, unreasonable) | |
| immovable(adjective, mean, strong, hard, determined) | |
| inelastic(adjective, hard, determined, resolute, rigid) | |
| intransigent(adjective, firm, determined, resolute) | |
| mulish(adjective, mean, strong, hard, firm) | |
| pertinacious(adjective, firm, determined, resolute) | |
| refractory(adjective, hard, rough, firm, grim) | |
| set in stone(expression, adjective, idiom, calm, mean) | |
| taut(adjective, rough, rigid) | |
| true(adjective, strong, firm, determined, careful) | |
| unalterable(adjective, calm, strong, rough, solid) | |
| unbendable(adjective, determined, resolute, uncompromising) | |
| unshakable(adjective, mean, strong, hard, firm) | |
| forceful(adjective, clear, strong, sound, severe) | |
| iron(adjective, mean, strong, hard, firm) | |
| pugnacious(adjective, rough) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 30 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |