1. As an adjective meaning "sick" or "unwell":
* "I'm feeling ill today. I think I have a cold."
* "He was ill for weeks after the surgery."
* "The doctor said she had a serious illness."
2. As an adjective meaning "bad" or "unfavorable":
* "The weather was ill for a picnic."
* "The company's financial situation is ill."
* "The government's policies had ill effects on the economy."
3. As a verb meaning "to harm" or "to wrong":
* "He ill-treated his employees."
* "They ill-advised the young man."
* "The policy ill-serves the community."
4. As an adverb meaning "badly" or "unfavorably":
* "The team played ill in the final game."
* "He spoke ill of his former boss."
* "The project was ill-conceived."
5. In the phrase "ill at ease":
* "I felt ill at ease at the formal dinner."
* "He was ill at ease with his new job."
6. In the phrase "ill-starred":
* "He was an ill-starred artist, whose work was never appreciated in his lifetime."
* "The project was doomed from the start, an ill-starred endeavor."
7. In the phrase "ill-gotten gains":
* "The politician was accused of amassing ill-gotten gains through corruption."
* "He was forced to return his ill-gotten fortune."
It's important to note that "ill" can sometimes be used in a more informal or idiomatic way. For example, "I'm feeling ill" can mean that you're not feeling well, but it can also be used to describe a feeling of being nauseous or disgusted.
Overall, the meaning of "ill" depends on the context in which it is used. By paying attention to the surrounding words and phrases, you can usually figure out the intended meaning.