Definition of "nonplussing" [nonplussing]

• Present participle of nonplus. (verb)

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• "Religious perspectives that don't fall into that definition are so nonplussing to many atheists, so like fundamentalists they deny that there can possibly be any legitimacy to such perspectives."
• "Makes a great albeit potentially nonplussing gift!"
• "He received visitors with the graciousness of the courteous head of a department, who resigns himself to listen to demands, allowing them to talk as he smiled faintly, and nonplussing them by his calmness."