nonplus

Etymology

The noun is derived from Latin nōn plūs (“no further, no more”), from nōn (“not”) + plūs (“additionally, more; further”) (ultimately from Proto-Indo-European *pleh₁- (“to fill”)). The verb is derived from the noun.

noun

  1. A state of bewilderment or perplexity.
    I believe they'd soon be put to a non-plus — You'd be quite too much for them, I'm sure. 1792, Charlotte Smith, Desmond, Broadview, published 2001, page 81

verb

  1. (transitive) To bewilder or perplex (someone); to confound, to flummox.

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