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nonplus

[ non-pluhs ]
/ nɒnˈplʌs /
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See synonyms for: nonplus / nonplused / nonplussed on Thesaurus.com

verb (used with object), non·plussed or non·plused,non·plus·sing or non·plus·ing.

to render utterly perplexed by something unexpected; puzzle completely.

noun

a state of utter perplexity.

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Origin of nonplus

First recorded in 1575–85; (noun) from Latin nōn plūs literally, “not more, no further,” i.e., a state in which nothing more can be done
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for nonplus

nonplus
/ (nɒnˈplʌs) /

verb -plusses, -plussing or -plussed or US -pluses, -plusing or -plused

(tr) to put at a loss; confoundhe was nonplussed by the sudden announcement

noun plural -pluses

a state of utter perplexity prohibiting action or speech

Word Origin for nonplus

C16: from Latin nōn plūs no further (that is, nothing further can be said or done)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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