lifelong regret
definitions
-
A persistent and enduring feeling of remorse, sorrow, or disappointment regarding a past decision, action, or missed opportunity that lasts throughout a person's entire life.ja: 生涯の悔い
examples
-
Not taking the opportunity to study abroad became his lifelong regret.
海外留学の機会を逃したことは、彼の生涯の悔いとなった。