Meaning of the word unperturbed in English

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

unperturbed

US /ˌʌn.pɚˈtɝːbd/
UK /ˌʌn.pəˈtɜːbd/

Adjective

not worried about something, especially when this is slightly surprising:

Example:
He seemed completely unperturbed at the idea of having to sing in a room full of strangers.