| temperamental(calm, happy) | |
| uncertain(adjective, clear, bad, weak, sure) | |
| untrue | |
| untruthful | |
| false(adjective, bad, open, weak, sound) | |
| lying | |
| deceptive(adjective, bad, open, weak, undependable) | |
| dubious(adjective, clear, honest, doubtful) | |
| mendacious | |
| mercurial(certain, sure) | |
| traitorous | |
| treacherous | |
| unconfirmed | |
| unfaithful | |
| unpredictable(adjective, predictable) | |
| unsafe(adjective, strong, secure) | |
| unstable(adjective, clear, bad, weak, sound) | |
| unsustainable | |
| volatile(certain, stable) | |
| vulnerable(adjective, bad, weak, undependable) |
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| APA | Smart Define. (2016). reliable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/reliable/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "reliable thesaurus" https://smartdefine.org/reliable/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, reliable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/reliable/thesaurus/antonyms>. |
| MLA | Smart Define. "reliable thesaurus" 3 March 2016. Web. 24 September 2026. <https://smartdefine.org/reliable/thesaurus/antonyms> |