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

Derived forms: nonplussed, nonplussing, nonplusses

See also: figure out, puzzle over

Type of: affect, bear on, bear upon, impact

Encyclopedia: Nonplus