Anybody not in Mr Squeers’s confidence would have supposed that he was quite out of the article in question, instead of having a large stock on hand ready for all comers; nor would the opinion of sceptical persons have undergone much alteration when he followed up the remark by poking Smike in the chest with the ferrule of his umbrella, and dealing a smart shower of blows, with the ribs of the same instrument, upon his head and shoulders.
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.