Nonplussed Definition

adjective

Bewildered; unsure how to respond or act.

Wiktionary

(proscribed, US, informal) Unfazed, unaffected, or unimpressed.

Wiktionary
Synonyms:
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verb

Simple past tense and past participle of nonplus.

Wiktionary
Antonyms:
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Origin of Nonplussed

  • From Latin non plus (“no more, no further”).

    From Wiktionary

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