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nonplussed - 2 dictionary results

non⋅plus

[non-pluhs, non-pluhs] verb, -plussed or -plused, -plus⋅sing or -plus⋅ing, noun
–verb (used with object)
1. to render utterly perplexed; puzzle completely.
–noun
2. a state of utter perplexity.

Origin:
1575–85; (n.) < L nōn plūs lit., not more, no further, i.e., a state in which nothing more can be done


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

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