nonplussed

/nɑnˈplʌst/
adjective
  1. Feeling confused or surprised, not knowing what to say or do. (This is the more common spelling of 'nonplused'.)
    • The sudden announcement left everyone nonplussed.
    • The chef was nonplussed when the main ingredient was missing.
    • He was nonplussed by her unexpected visit.
  2. In informal use, sometimes used to mean 'unfazed' or 'not bothered' (though this is considered incorrect by many).
    • Despite the chaos, he remained nonplussed and focused.
    • She was completely nonplussed by the criticism, continuing her work calmly.
    • Some people use 'nonplussed' to mean 'unimpressed,' but careful writers avoid this.
What does "nonplussed" mean? | whatsthatwordmean | whatsthatwordmean