Skepticism is the view that knowledge is unattainable. It comes in varying strengths. In the strongest version, it is a thesis about all knowledge, the global denial that anyone has ever known anything.
More commonly, though, skepticism is constrained. It is the denial of the possibility of knowledge of some specific kind. Moral skepticism, for example, is the view that there is no such thing as knowledge of right and wrong, good and bad.
External world skepticism is the thesis that there could be no knowledge with respect to matters outside of one’s mind. You get the idea.
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