| sick | (adjective) affected by an impairment of normal physical or mental function | Synonyms: ill |
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| (adjective) shockingly repellent; inspiring horror | Synonyms: ghastly, grim, grisly, gruesome, macabre |
| (adjective) having a strong distaste from surfeit | Synonyms: disgusted, fed up, sick of, tired of |
| (adjective) affected with madness or insanity | Synonyms: brainsick, crazy, demented, disturbed, mad, unbalanced, unhinged |
| (adjective) deeply affected by a strong feeling | - |
| (adjective) (of light) lacking in intensity or brightness; dim or feeble | Synonyms: pale, pallid, wan |
| (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, nauseous, queasy, sickish |
| sickening | (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, noisome, offensive, queasy, vile |
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| sickish | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, nauseous, queasy, sick |
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| sickly | (adjective) somewhat ill or prone to illness | Synonyms: ailing, indisposed, peaked, poorly, seedy, under the weather, unwell |
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| (adjective) unhealthy looking | Synonyms: sallow |