The Vocalibrate dictionary
nonplussed
US/nɑːnˈplʌst/GB/nɒnˈplʌst/adjective
so surprised and confused that you don't know how to react
He was nonplussed when the interviewer asked him to sing, and could only stare.
- Near in meaning
- bewilderedbaffledperplexedflummoxedpuzzleddumbfoundedconfused
- In the family
- nonplus