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When we talk about challenging something, the most common word used in English is "question." For instance, you might say, "I question your judgment on this matter," which means you doubt or don't fully trust someone's decision. Another related term could be "challenge," as in, "He challenged her claim by providing evidence." This implies that he disputed or opposed what she said. Both words carry a sense of skepticism or opposition, but they can be used in various contexts depending on the nuance you wish to convey.