しぶとい
shibutoi

i-Adjective

1. tenacious; tough; enduring; dogged; headstrong; stubborn; obstinate; unyielding

かれ結構 けっこうしぶといね。転 ころんでもただでは きぬ、いい根性 こんじょうしているよ。
karewa kekkō shibutoine. korondemo tadadewa okinu ii konjō shite iruyo.
He's a tenacious guy who always manages to come out on top. He's the kind of guy who can turn any situation to his advantage.