Unable or unwilling?

From Epicurus...

Is God willing to prevent evil, but not able? Then he is not omnipotent. Is he able, but not willing? Then he is malevolent. Is he both able and willing? Then whence cometh evil? Is he neither able nor willing? Then why call him God?

Seen in a post by Jeff M.

For a metaphysical entity, I’m not convinced that there is a meaningful difference between unwilling and unable.