self-assured

US /ˌself əˈʃʊrd/
UK /ˌself əˈʃʊrd/
"self-assured" picture
1.

autoconfiante, seguro de si

confident in one's own abilities or character

:
She walked into the room with a self-assured smile.
Ela entrou na sala com um sorriso autoconfiante.
His calm and self-assured demeanor impressed everyone.
Sua postura calma e autoconfiante impressionou a todos.