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.fr: Regret permanent
examples
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Not taking the opportunity to study abroad became his lifelong regret.
Ne pas avoir saisi l'opportunité d'étudier à l'étranger est devenu son regret de toute une vie.