| uniform(soft, yielding, uneven, pliable) | |
| unvarying | |
| wooden(adjective, stiff, inflexible) | |
| inexorable(adjective, kind, cruel, pitiless) | |
| unadaptable(adjective, soft, firm, stiff, yielding) | |
| die-hard(adjective, uncompromising) | |
| fixed | |
| intransigent | |
| ornery(adjective, firm, stiff) | |
| resistant(adjective, firm, stiff) | |
| rigorous | |
| strict(adjective, authoritarian) | |
| crisp(adjective, dry, brittle) | |
| inelastic | |
| nice | |
| unresponsive(adjective, firm, stiff) | |
| abrupt | |
| adamantine | |
| authoritarian | |
| binding |
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| APA | Smart Define. (2016). flexible thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/flexible/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "flexible thesaurus" https://smartdefine.org/flexible/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, flexible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/flexible/thesaurus/antonyms>. |
| MLA | Smart Define. "flexible thesaurus" 28 March 2016. Web. 25 September 2026. <https://smartdefine.org/flexible/thesaurus/antonyms> |