To these high matters Martin responded, "Rot!" He insisted that there is no Truth but only many truths; that Truth is not a colored bird to be chased among the rocks and captured by its tail, but a skeptical attitude toward life.
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.