悔い

1. Origins, structure, and basic meaning

• Structure: 悔い (くい) is a noun for regret or lasting remorse over something in the past.
• Basic usage: It appears in having no regrets after giving one's all or carrying regret for life over an apology never made.
  • 最後まで力を出したので試合に悔いはありません。 — I have no regrets about the game because I gave my all until the end.
  • 彼は謝れなかったことを一生の悔いとして抱えていました。 — He carried lifelong regret over never having apologized.

2. Common pitfalls and similar expressions

• No regret and lasting remorse
  • 悔いはない states that no regret remains, while 一生の悔いとして抱える means carrying that regret for a lifetime.