Ill
Ill adjective - Affected with nausea.
Usage example: she grew ill from the constant rocking motion of the boat
Sick is a synonym for ill in health topic. In some cases you can use "Sick" instead the word "Ill" as an adjective or an adverb, when it comes to topics like unwell, obscene, bad, bedridden. popular alternative
Nearby Word: illness
Sick
Sick adjective - Temporarily suffering from a disorder of the body.
Usage example: those coworkers who always seem to get sick immediately before or after long holiday weekends
Ill is a synonym for sick in health topic. You can use "Ill" instead the word "Sick" as an adjective or an adverb, if it concerns topics such as unwell, obscene, bad, nauseous. popular alternative
Mutual synonyms
Both words in one sentence
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From Comic 41 of Kill la Kill AU, we have Ryuuko's wish to be the sick one instead of her then ill sister Satsuki, which, as explained here, traded her health in exchange for Satsuki's poor health, making her the sick one instead.
Source: Equivalent Exchange -
Some just see the zombies as ill loved ones sick with a really bad disease, others consider them to actually be an improvement over humanity.
Source: Zombie Advocate -
Ill Girl: Moe has a weak constitution and gets sick easily, but her actual health condition is not explained.
Cite this Source
Sick and Ill. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/ill/sick
Ill & Sick. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/ill/sick>.
Sick or Ill. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/ill/sick.
Google Ngram Viewer shows how "ill" and "sick" have occurred on timeline