nonplussed


Concise Oxford English Dictionary © 2008 Oxford University Press:
nonplus /nɒnˈplʌs/
verb (nonplusses, nonplussing, nonplussed)
  • 1 surprise and confuse; flummox.
  • 2 (as adj. nonplussed) N. Amer. informal unperturbed.
noun a state of being nonplussed.
– origin C16: from L. non plus ‘not more’.
'nonplussed' also found in these Oxford entries:

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