lifelong regret
definitions
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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.de: Lebenslange Reue
examples
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Not taking the opportunity to study abroad became his lifelong regret.
Die Chance, im Ausland zu studieren, nicht zu nutzen, wurde zu seiner lebenslangen Reue.