2 entries under this word

Nonplus

Nōn'plus, n.

noun

n. [Lat. non, not, and plus, more, further.] A state in which one is unable to proceed or decide; insuperable difficulty; puzzle.

Both of them are a perfect nonplus and baffle to all human understanding. South.

verbtransitive

v. t. [imp. & p. p. NONPLUSED (nōn′-plust); p. pr. & vb. n. NONPLUSING.] To puzzle; to confound; to put to a stand; to stop by embarrassment.

Your situation has nonplused me. T. Scott.