自信(じしん)たっぷりconfident, full of confidence, cocky, full of oneself

自信(じしん)たっぷりの人(ひと)は頼(たよ)り甲斐(がい)があります。

There's something reliable about a person who is full of confidence.

一流(いちりゅう)シェフは自分(じぶん)の料理(りょうり)の腕(うで)に自信(じしん)たっぷりです。

A top-class chef has full confidence in their cooking skills.

クラスで一番(いちばん)の秀才(しゅうさい)が自信(じしん)たっぷりに問題(もんだい)の答(こた)えを発表(はっぴょう)した。

The brightest student in the class confidently announced the answer to the question.

自分(じぶん)に自信(じしん)たっぷりな人(ひと)は、キラキラ見(み)えて魅力(みりょく)的(てき)に感(かん)じます。

People who are confident in themselves give off a radiant and attractive vibe.

沢山(たくさん)練習(れんしゅう)をすればこそ、舞台(ぶたい)で自信(じしん)たっぷりに演技(えんぎ)を披露(ひろう)出来(でき)るのです。

It is precisely because you practice a lot that you can perform on stage, full of confidence.