Non″plus′ (?), v. t. [imp. & p. p.Nonplused (?) or 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.