nonplus

Definition: (verb) To put at a loss as to what to think, say, or do.
Synonyms: bewilder, dumbfound, flummox, baffle, mystify, perplex, puzzle, stupefy, amaze, gravel, vex, pose, stick, beat, get.
Usage: He was nonplussed by the sudden announcement that the company where he had worked for the past 20 years was declaring bankruptcy and shutting its doors.
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