impeccable

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im·pec·ca·ble / imˈpekəbəl/ • adj. (of behavior, performance, or appearance) in accordance with the highest standards of propriety; faultless: a man of impeccable character. ∎ rare Theol. not liable to sin.DERIVATIVES: im·pec·ca·bil·i·ty / -ˌpekəˈbilitē/ n.im·pec·ca·bly / -blē/ adv.