[non-pluhs, non-pluhs]
verb (used with object), nonplussed or nonplused, nonplussing or nonplusing.
to render utterly perplexed; puzzle completely.
a state of utter perplexity.

1575–85; (noun) < Latin nōn plūs literally, not more, no further, i.e., a state in which nothing more can be done

1. perplex, confuse, confound, disconcert. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonplus (nɒnˈplʌs)
vb , (US) -plusses, -plussing, -plussed, -pluses, -plusing, -plused
1.  (tr) to put at a loss; confound: he was nonplussed by the sudden announcement
n , -plusses, -plussing, -plussed, -pluses, -plusing, -plused, -pluses
2.  a state of utter perplexity prohibiting action or speech
[C16: from Latin nōn plūs no further (that is, nothing further can be said or done)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1580s (n.), properly "state where 'nothing more' can be done or said," from L. non plus "no more, no further." The verb meaning "to bring to a nonplus, to perplex" is attested from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Her mission is to reveal the inner workings of academe, the swirling political currents that may nonplus the naive.
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