Sick

The answer to the crossword question “Sick is ILL” is simply the word “ILL“. The clue is based on the common usage of the word “ill” as a synonym for “sick“. Both words are often used interchangeably to describe someone who is not feeling well or who is suffering from a physical or mental illness. In the context of the crossword, the answer to the clue “Sick is ILL” is unambiguously “ILL“. This is because the word “is” acts as a linking verb that connects the two parts of the clue together, indicating that they are synonymous.