nonplus

/nɑnˈplʌs/
noun
  1. A state of being confused or uncertain.
    • He was in a complete nonplus when he saw the empty room.
    • The complicated instructions put everyone into a nonplus.
    • Her nonplus was evident from the puzzled look on her face.
verb
  1. To surprise or confuse someone so much that they are unsure how to react.
    • The magician's trick nonplused the audience, leaving them speechless.
    • The unexpected question nonplused the speaker, who paused for a long moment.
    • Her sudden resignation nonplused the entire team.
Antonyms
What does "nonplus" mean? | whatsthatwordmean | whatsthatwordmean