unflappable

/ʌnˈflæpəbəl/

Misollar

Tom's unflappable, even under great pressure.
He was unflappable in the face of danger.

sifat adjective

Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily.

Manbalar: Wiktionary (Free Dictionary API orqali), Datamuse, Tatoeba (CC BY 2.0 FR), MyMemory.