nonplus
[verb]
Synonyms: beat, buffalo, get, stick, stump, stagger, boggle, dumbfound

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Related Idioms: put (or drive) to one's wit's end, put up a tree (or stump), throw on one's beam end
Related Words: baffle, frustrate, stymie, thwart, confound, perplex, mystify, dumbfound, overcome, throw, paralyze, confuse, flurry, fluster, muddle, rattle, faze, balk

[TahlilGaran] English Synonym Dictionary ▲

non·plus (nŏn-pls)
tr.v. non·plused, also non·plussed non·plus·ing, non·plus·sing non·plus·es, non·plus·ses
To put at a loss as to what to think, say, or do; bewilder.
n.
A state of perplexity, confusion, or bewilderment.

[TahlilGaran] American Dictionary ▲

nonplus
[From Latin nōn pls, no more  : nōn, not; see non- + pls, more; see pelə-¹ in Indo-European Roots.]

[TahlilGaran] American Dictionary ▲