| endangered(adjective, weak, soft, unreliable) | |
| exposed | |
| forfeit(verb, disregard, fail, loosen, unfix) | |
| free(verb, disregard, fail, loosen, unfix) | |
| give up(verb, expression, phrasal verb, hold, disregard) | |
| loose(verb, adjective, weak, disregard, fail) | |
| loosen(verb, disregard, fail, unfix) | |
| open(verb, adjective, disregard, fail, loosen) | |
| questionable | |
| release(noun, verb, disregard, fail, loosen) | |
| risky(adjective, strong, safe) | |
| undecided(adjective, clear, weak, soft, unreliable) | |
| undefended(adjective, unprotected) | |
| unreliable(adjective, weak, soft) | |
| unstable(adjective, clear, weak, sound, soft) | |
| unsustainable | |
| untrustworthy(adjective, weak, soft, unreliable) | |
| baneful | |
| break(verb, destroy, agree, continue, face) | |
| defenseless |
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| APA | Smart Define. (2015). secure thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/secure/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "secure thesaurus" https://smartdefine.org/secure/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, secure thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/secure/thesaurus/antonyms>. |
| MLA | Smart Define. "secure thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/secure/thesaurus/antonyms> |