11 entries under sound topic. ×
| shaky(adjective, strong, doubtful, trembling) | |
| unstable(adjective, clear, steady) | |
| unsettled(adjective, clear, strong, weak) | |
| wobbly(adjective, weak, obscure, uncertain) | |
| frail(adjective, strong, weak, breakable) | |
| flimsy(adjective, strong, light, thin) | |
| infirm(adjective, weak, sick, unhealthy) | |
| unsound(strong, well) | |
| anile | |
| decrepit | |
| sensile |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/firm/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/antonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/firm/thesaurus/antonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/firm/thesaurus/antonyms> |