| feeble(adjective, strong, fit, ineffective) | |
| unhealthy(adjective, sick) | |
| ill(adjective, sick) | |
| insane(adjective, sound, sensible, foolish, ill) | |
| paranoid | |
| harmful(adjective, good, harmless) | |
| allergic | |
| noxious(adjective, sweet, injurious, deadly) | |
| infirm(adjective, weak, sound, sick) | |
| damaging | |
| fragile(adjective, strong) | |
| poorly | |
| trippy | |
| sick(adjective, healthy, well) | |
| ailing | |
| baneful | |
| deleterious | |
| delicate(adjective, strong, hard, harsh, sickly) | |
| frail(strong, sound) | |
| gangrenous |
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| APA | Smart Define. (2016). healthy thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/healthy/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "healthy thesaurus" https://smartdefine.org/healthy/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, healthy thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/healthy/thesaurus/antonyms>. |
| MLA | Smart Define. "healthy thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/healthy/thesaurus/antonyms> |