C2 adjective ˌɪm.pəˈtɜː.bə.bəl
imperturbable
冷静沈着
Meaning
Unable to be upset or excited; not easily disturbed.
Example
His imperturbable nature made him a great leader.
彼の冷静沈着な性格は、彼を偉大なリーダーにした。