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The Collaborative International Dictionary
Nonplussing

Nonplus \Non"plus`\, v. t. [imp. & p. p. Nonplusedor Nonplussed; p. pr. & vb. n. Nonplusing or Nonplussing.] To puzzle; to confound; to perplex; to cause to stop by embarrassment.

He has been nonplused by Mr. Dry's desiring him to tell what it was that he endeavored to prove.
--Spectator.

Wiktionary
nonplussing

vb. (present participle of nonplus English)

WordNet
nonplus
  1. v. be a mystery or bewildering to; "This beats me!"; "Got me--I don't know the answer!"; "a vexing problem"; "This question really stuck me" [syn: perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, gravel, amaze, dumbfound]

  2. [also: nonplussing, nonplusses, nonplussed]

nonplussing

See nonplus

Usage examples of "nonplussing".

She closed her eyes for some moments, as if gathering strength to proceed with her remarkable, nonplussing self-assertion.