一生懸命: With all one's effort

彼かれは一生懸命いっしょうけんめいに働はたらいて、弟おとうとを大学だいがくに行いかせた。

He worked as hard as he could and put his younger brother through university.

一生懸命いっしょうけんめいな後輩こうはいの姿すがたを見みていると、自分じぶんも頑張がんばろうという気きになる。

Watching my earnest junior colleague makes me want to try hard too.