- Definitions|2
- Thesaurus|3k
- Abbreviations|0
124 entries under tough topic. ×
| unswerving(adjective, strong, smooth, firm) | |
| austere(adjective, strong, hard, severe) | |
| incompliant(adjective, firm, solid, resist) | |
| stiff-necked(adjective, mean, strong, hard) | |
| die-hard(adjective, moderate, resist, determined) | |
| hardened(adjective, person, hard, firm) | |
| hardheaded(adjective, strong, hard, cold) | |
| staunch(adjective, strong, flat, firm) | |
| callous(adjective, person, hard, rough) | |
| flinty(adjective, strong, hard, severe) | |
| hard-line(adjective, strong, hard, severe) | |
| single-minded(adjective, firm, harsh, cruel) | |
| cruel(adjective, strong, hard, severe) | |
| hard-boiled(adjective, person, mean, strong, hard) | |
| indomitable(adjective, set, strong, hard) | |
| recalcitrant(adjective, firm, unreasonable, fixed) | |
| self-willed(adjective, firm, determined, resolute) | |
| tight(adjective, close, strong, hard) | |
| contumacious(adjective, firm, determined, unreasonable) | |
| persevering(adjective, strong, flat, firm) |
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| APA | Smart Define. (2016). inflexible thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2016, inflexible thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>. |
| MLA | Smart Define. "inflexible thesaurus" 24 March 2016. Web. 1 October 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms> |