- Definitions|2
- Thesaurus|3k
- Abbreviations|0
124 entries under tough topic. ×
| adamantine(adjective, strong, hard, firm) | |
| implacable(adjective, mean, strong, hard) | |
| intractable(adjective, strong, hard, rough) | |
| hard-nosed(adjective, mean, strong, hard, secure) | |
| severe(adjective, strong, hard, severe) | |
| dogged(adjective, mean, strong, hard) | |
| mulish(adjective, mean, strong, hard) | |
| inelastic(adjective, hard, firm, solid) | |
| stern(adjective, hard, severe, rough) | |
| strict(adjective, strong, hard, moderate) | |
| grim(adjective, strong, hard, severe) | |
| rigorous(adjective, strong, hard, severe) | |
| harsh(adjective, mean, strong, hard) | |
| iron(adjective, mean, strong, hard) | |
| headstrong(adjective, strong, hard, rough) | |
| steely(adjective, strong, hard, firm) | |
| persistent(adjective, strong, flat, firm) | |
| refractory(adjective, hard, rough, firm) | |
| set in stone(expression, adjective, idiom, mean, hard) | |
| solid(adjective, strong, hard, secure, smooth) |
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| APA | Smart Define. (2016). inflexible thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, inflexible thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>. |
| MLA | Smart Define. "inflexible thesaurus" 24 March 2016. Web. 30 September 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms> |