noun, adverb
Literary word meaning the entirety of one's life. Often used in set phrases like 畢生の大作 (one's life's work) or 畢生の事業 (one's life's enterprise).
この絵は彼の畢生の大作だ。
This painting is his life's great work.
彼は畢生をかけてこの研究に取り組んだ。
He devoted his entire life to this research.