unperturbed[adjective]Synonyms: calm, as cool as a cucumber, composed, cool, placid, unfazed
(informal), unruffled, untroubled, unworried
[TahlilGaran] English Synonym Dictionary ▲
un‧per‧turbed /ˌʌnpəˈtɜːbd◂ $ -pərˈtɜːrbd◂/
adjective not worried or annoyed by something that has happened:
John seemed unperturbed by the news. [TahlilGaran] Dictionary of Contemporary English ▲