This is really the only point on which Don Juan is sceptical; for he is a devout believer in an ultimate hell, and risks damnation only because, as he is young, it seems so far off that repentance can be postponed until he has amused himself to his heart’s content.
There are no more uses of "skeptical" in the book.
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I am skeptical about her plan.
She is skeptical any time someone says it is important she pay them a lot for a car repair.