| decrepit(unhealthy, frail) | |
| deranged(unhealthy, frail) | |
| fragile(unhealthy, frail) | |
| insecure(unhealthy, frail) | |
| insubstantial(unhealthy, frail) | |
| lunatic(unhealthy, frail) | |
| not feeling well(expression, idiom, weak, sick) | |
| not solid(expression, unhealthy, frail) | |
| off-color(unwell, poorly) | |
| off-colour(sick, poorly) | |
| out of sorts(expression, idiom, sick, unwell) | |
| unbacked(unhealthy, frail) | |
| unbalanced(unhealthy, frail) | |
| unhinged(unhealthy, frail) | |
| unsafe(foolish, fantastic, unhealthy, frail) | |
| unsteady(adjective, false, unstable, sick) |
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| APA | Smart Define. (2016). invalid thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/invalid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "invalid thesaurus" https://smartdefine.org/invalid/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, invalid thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/invalid/thesaurus/synonyms>. |
| MLA | Smart Define. "invalid thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/invalid/thesaurus/synonyms> |