noun
a person who pretends to be knowledgeable or clever; a know-it-all
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The wiseacre in the meeting always had a clever response to every question.
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Don't listen to that wiseacre, he's always trying to show off his intelligence.
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That wiseacre thinks he knows everything, but he's just a know-it-all.
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The wiseacre's words were like a double-edged sword, cutting through the ignorance of those around him.