Nonplus \Non"plus\, n. [L. non not + plus more, further. See {Plural}.] A state or condition which baffles reason or confounds judgment; insuperable difficulty; inability to proceed or decide; puzzle; quandary.
Both of them are a perfect nonplus and baffle to all human understanding. --South.
Nonplus \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.