To nonplus is to baffle or confuse someone to the point that they have nothing to say. Something weird and mysterious can nonplus you, like a play that is performed entirely by chickens.

If you know a little French or Latin, you'll recognize that "non plus" means "no more." When something bewildering nonpluses you, there's no more you can say or do about it. A goal of getting poor grades, running with a bad crowd, and refusing to eat would leave your parents nonplussed. Sometimes people misuse nonplus to mean "unimpressed," but that's not correct: to nonplus is to puzzle, confuse, and dumbfound.

Definitions of nonplus
  1. verb
    be a mystery or bewildering to
    synonyms: amaze, baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, perplex, pose, puzzle, stick, stupefy, vex
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    mix up, stump
    cause to be perplexed or confounded
    set a difficult problem or riddle
    elude, escape
    be incomprehensible to; escape understanding by
    defy, refuse, resist
    elude, especially in a baffling way
    type of:
    bedevil, befuddle, confound, confuse, discombobulate, fox, fuddle, throw
    be confusing or perplexing to; cause to be unable to think clearly
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