self-assured

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

pewny siebie, samodzielny

confident in one's own abilities or character

:
She walked into the room with a self-assured smile.
Weszła do pokoju z pewnym siebie uśmiechem.
His calm and self-assured demeanor impressed everyone.
Jego spokojna i pewna siebie postawa zaimponowała wszystkim.