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Entry 2 senses · 2 variants Webster, 1913

Nonplus

· Non·plus · IPA /ˌnɑnˈplʌs/
01 n. A state or condition which baffles reason or confounds judgment; insuperable difficulty; inability to proceed or decide; puzzle; quandary.
  1. 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.” — South.
02 v. t. To puzzle; to confound; to perplex; to cause to stop by embarrassment.
imp. & p. p. Nonplused; p. pr. & vb. n. Nonplusing
  1. 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.” — Spectator.