The meaning of ILL is not in good health; also : nauseated. How to use ill in a sentence.

Ill and sick are both adjectives that mean ‘not in good health’. We use both ill and sick after a verb such as be, become, feel, look or seem: … He treated her very ill. I realize one shouldn't …

ILL definition: of unsound physical or mental health; unwell; sick. See examples of ill used in a sentence.

1. Evil, wrongdoing, or harm: the ill that befell the townspeople. 2. Something that causes suffering; trouble: the social ills of urban life. 3. Something that reflects in an unfavorable way …

Ill is the more formal word. In the U.S. the two words are used practically interchangeably except that sick is always used when the word modifies the following noun: He looks sick (ill); a sick …

Definition of ill adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Dec 14, 2025 · (slang) Extremely bad (bad enough to make one ill). Generally used indirectly with to be.

Someone who is ill is suffering from a disease or a health problem. In November 1941 Payne was seriously ill with pneumonia.

I felt ill [= sick] all afternoon. What's wrong? You look ill. He had been ill for several years.

ill meaning, definition, what is ill: suffering from a disease or not feeling ...: Learn more.