力ちから及およばず

expression

beyond one's ability; not up to the task; despite one's best efforts

Fixed expression used when one's efforts or ability fall short, often with a humble or regretful tone. Commonly appears in set phrases like 力及ばず申し訳ありません or 力及ばず残念です.

• 力ちから及およばず、目もく標ひょうを達たっ成せいできませんでした。