| reliable(adjective, clear, bad, weak, sound) | |
| resolute | |
| secure(verb, adjective, clear, weak, sound) | |
| set | |
| smooth(adjective, dull, strong, hard, sharp) | |
| sound(adjective, clear, steady) | |
| stationary | |
| sure(adjective, clear, sound, steady) | |
| together(adjective, upset, composed) | |
| unchangeable | |
| unchanging(adjective, clear, sound, steady) | |
| unvarying | |
| assured | |
| regular | |
| cognitive(careless, stupid, unreasonable) | |
| cool | |
| definite(adjective, clear, sound, steady) | |
| dependable(adjective, clear, weak, sound, steady) | |
| durable | |
| equable |
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| APA | Smart Define. (2016). unstable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unstable/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "unstable thesaurus" https://smartdefine.org/unstable/thesaurus/antonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, unstable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unstable/thesaurus/antonyms>. |
| MLA | Smart Define. "unstable thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/unstable/thesaurus/antonyms> |