self-assured
US /ˌself əˈʃʊrd/
UK /ˌself əˈʃʊrd/

1.
yakin diri, berkeyakinan
confident in one's own abilities or character
:
•
She walked into the room with a self-assured smile.
Dia masuk ke bilik dengan senyuman yakin diri.
•
His calm and self-assured demeanor impressed everyone.
Sikapnya yang tenang dan yakin diri mengagumkan semua orang.