The Collaborative International Dictionary
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
vb. (present participle of nonplus English)
WordNet
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]
[also: nonplussing, nonplusses, nonplussed]
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.