Crossword Genius

Well, this is just the opposite (3)

Ross

I believe the answer is:

ill

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'well this is just the opposite' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

Can you help me to learn more?

(Other definitions for ill that I've seen before include "Ailing" , "weak" , "Unhealthy" , "Infirm" , "Not well, sick" .)

I've seen this clue in The Irish News.
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