self-confident
🇺🇸
/ˌself ˈkɑːnfɪdənt/
🇬🇧
/ˌself ˈkɒnfɪdənt/
feeling sure about yourself and what you can do
She gave a self-confident speech that impressed everyone.
彼女は自信に満ちたスピーチをし、皆に感銘を与えた。