- so surprised and confused that one is unsure how to react；not disconcerted; unperturbed.
- 1. so surprised and confused that one is unsure how to react Henry looked completely nonplussed 同義詞
- 2. North American informal not disconcerted; unperturbed. 同義詞
- (of a person) surprised and confused so much that they are unsure how to react: he would be completely nonplussed and embarrassed at the idea
Oxford American Dictionary