| stable(adjective, clear, weak, sound, soft) | |
| steady(adjective, clear, sound, stable, fixed) | |
| peaceful | |
| self-confident | |
| strong(adjective, clear, sound, steady) | |
| firm(noun, adjective, clear, sound, steady) | |
| sturdy(adjective, solid, durable) | |
| certain(adjective, clear, sound, steady) | |
| constant(adjective, clear, sound, sympathetic, steady) | |
| adaptive | |
| sane(adjective, sound, reasonable, stupid, insane) | |
| balanced | |
| lasting | |
| changeless | |
| easy(adjective, clear, sound, steady) | |
| fixed | |
| level(rough, irregular, broken, indefinite) | |
| loyal | |
| net force | |
| placid |
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| APA | Smart Define. (2016). unstable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unstable/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "unstable thesaurus" https://smartdefine.org/unstable/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, unstable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unstable/thesaurus/antonyms>. |
| MLA | Smart Define. "unstable thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/unstable/thesaurus/antonyms> |