自信家(じしんか)person who has great confidence (faith) in himself

自信(じしん)家(か)だった娘(むすめ)が自信(じしん)を失(うしな)ってしまった。

The daughter, who was a person who has great confidence (faith) in himself, lost her confidence.

父(ちち)は自信家(じしんか)で、いつも自分(じぶん)が正(ただ)しいと思(おも)っている。

My father is a person who has great confidence (faith) in himself and always thinks he is right.

自信(じしん)家(か)の彼女(かのじょ)は自分(じぶん)の間違(まちが)いを認(みと)めようとしません。

The person who has great confidence in herself doesn't try to admit her own mistakes.

私(わたし)は語学(ごがく)について自信家(じしんか)で、語学能力(ごがくのうりょく)に優(すぐ)れていると思(おも)っています。

I am a self-confident person when it comes to language learning, and I believe I excel in language skills.

自信家(じしんか)なのは構(かま)わないが、間違(まちが)った持論(じろん)をベラベラと語(かた)るのは許(ゆる)せない。

It's fine to be a person who has great confidence (faith) in himself, but I can't tolerate someone babbling on about their incorrect personal theories.