頑固(がんこ)

stubborn; obstinate

頑張(がんば)る

to persevere; to do one's best

頑張(がんば)り

effort; perseverance

頑丈(がんじょう)

sturdy; durable

頑固者(がんこもの)

stubborn person

頑(かたく)な

stubborn; obstinate

頑(がん)として

stubbornly; firmly

頑強(がんきょう)

tough; sturdy; robust

父(ちち)は頑固(がんこ)で、自分(じぶん)の考(かんが)えを変(か)えない。

My father is stubborn and does not change his opinion.

毎日頑張(まいにちがんば)ることが大切(たいせつ)です。

It is important to work hard every day.