1
very hard;with utmost effort;as hard as one can;with all one's might;for dear life;eagerly;desperately
もっと一生懸命勉強すべきだったのに。
You should have worked harder.
Other forms
一生けんめい 【いっしょうけんめい】 (search-only kanji form) · 一生けん命 【いっしょうけんめい】 (search-only kanji form)