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Adjective: nonplussed  ,nón'plúst
  1. Filled with bewilderment
    - at a loss, nonplused [US], puzzled, thrown, perplexed
Verb: nonplus (nonplussed,nonplussing)  nón'plús
  1. Confuse or leave at a loss because of something complex or difficult to understand
    "These questions nonplus even the experts";
    - confuse, throw, fox, befuddle, fuddle, bedevil, confound, discombobulate [informal], perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, gravel, dumbfound

See also: perplexed

Type of: be

Encyclopedia: Nonplus

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non-paying
nonpayment
nonperformance
nonperiodic
nonperson
nonpersonal
nonphotosynthetic
nonphysical
nonplus
nonplused
nonplussed
nonpoisonous
non-poisonous
nonpolar
nonpolitical
nonporous
nonpregnant
nonprehensile
nonprescription
nonproductive
nonprofessional