Meaning of the word nonplussed in English

What does nonplussed mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

nonplussed

US /ˌnɑːnˈplʌst/
UK /ˌnɒnˈplʌst/

Adjective

1.

(especially British English) so surprised by something that you do not know what to say or do

Example:
She was completely nonplussed by his sudden proposal.
The unexpected question left him utterly nonplussed.
2.

(especially American English) not at all disturbed, confused, or surprised

Example:
Despite the chaos, he remained completely nonplussed.
Her calm demeanor left her audience nonplussed by the shocking news.