Nonplus /(?)/

1. 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.

imp. & p. p. Nonplused; p. pr. & vb. n. Nonplusing

1. 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.