| droopy | |
| effete | |
| elastic | |
| inconstant(adjective, weak, obscure, uncertain) | |
| infirm(adjective, weak, sound, sick, unhealthy) | |
| light | |
| liquid(adjective, fluid, flowing, melting) | |
| malleable(adjective, rigid, pliable) | |
| movable(adjective, unhealthy) | |
| mushy | |
| pliant(adjective, easy) | |
| precarious(adjective, strong, stable, doubtful, tricky) | |
| rickety | |
| uncertain(adjective, weak, obscure) | |
| undecided(adjective, weak, obscure, uncertain) | |
| undetermined | |
| unhealthy | |
| unsound(strong, sound, well) | |
| volatile(adjective, certain, stable, changeable, explosive) | |
| wimpy(fit, healthy) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/firm/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/firm/thesaurus/antonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/firm/thesaurus/antonyms> |