NONPLUSING

Verb

nonplusing

present participle of nonplus

Source: Wiktionary

NONPLUS

Non"plus, n. Etym: [L. non not + plus more, further. See Plural.]

Definition: A state or condition which daffles reason or confounds judgment; insuperable difficalty; inability to proceed or decide; puzzle; quandary. Both of them are a perfect nonplus and baffle to all human understanding. South.

Non"plus`, v. t. [imp. & p. p. Nonplused or Nonplussed; p. pr. & vb. n. Nonplusing or Nonplussing.]

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition