nonplusment
n.—Gloss: State of confusion or befuddlement; the noun form of the verb “nonplus.” Note: Not a new word, but rare. «Perhaps unsurprisingly—apologies to the good people of 1956 Miami—the reception amid the swizzle sticks and shuffleboards was general nonplusment.» —“A Long Wait for Another Shot at Broadway” by Charles Isherwood New York Times Apr. 22, 2009. (source: Double-Tongued Dictionary)
Further reading
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