unruffled
adjective uk/ʌnˈrʌf.əld/ us/ʌnˈrʌf.əld/
平静的;泰然自若的
calm; not nervous or worried, usually despite a difficult situation
For a man in danger of losing his job, he appeared fairly unruffled. 对于一个可能会丢掉工作的人来说，他表现得相当镇定自若。
Synonym: unperturbed