What does 一生懸命 mean?
一生懸命 is a Japanese noun meaning “very hard (as in "to work hard"), with utmost effort” in English. It is written as 一生懸命 in kanji, いっしょうけんめい in hiragana, and isshoukenmei in romaji. This word is part of JLPT N4 vocabulary.
Example sentence
もっと一生懸命勉強すべきだったのに。
You should have worked harder.