adj. 25B6; adjective UNTROUBLED, undisturbed, unworried, unconcerned, unmoved, unflustered, unruffled, undismayed; calm, composed, cool, collected, unemotional, self-possessed, self-assured, level-headed, unfazed, laid-back.
UNPERTURBED
Meaning of UNPERTURBED in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012