| flaccid(adjective, drooping) | |
| loose(adjective, weak, obscure, uncertain) | |
| changed greatly | |
| ever-changing | |
| fragile(adjective, strong, dainty, breakable) | |
| frail(adjective, strong, weak, sound, breakable) | |
| flimsy(adjective, strong, light, sound, thin) | |
| floppy | |
| insecure(strong, steady) | |
| limp | |
| moving(adjective, weak, obscure, uncertain) | |
| pliable(adjective, easy) | |
| spongy | |
| squashy | |
| squishy | |
| unfixed(adjective, weak, obscure, uncertain) | |
| unsteady(adjective, weak, obscure, uncertain) | |
| vacillant | |
| alterable(adjective, weak, obscure, uncertain, binding) | |
| breakable |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/firm/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/firm/thesaurus/antonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/firm/thesaurus/antonyms> |