Meaning of UNPERTURBED in English

UNPERTURBED

un ‧ per ‧ turbed /ˌʌnpəˈtɜːbd◂ $ -pərˈtɜːrbd◂/ BrE AmE adjective

not worried or annoyed by something that has happened:

John seemed unperturbed by the news.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.