彼は強情だから、一度決めたら意見を変えないだろう。
He's stubborn, so once he's made up his mind he probably won't change his opinion.
そんなに強情を張らないで、素直に謝りなさい。
Stop being so stubborn and just apologize.
娘は強情な性格で、なかなか人の言うことを聞かない。
My daughter is obstinate by nature and rarely listens to what others say.