implacable

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im·plac·a·ble / imˈplakəbəl/ • adj. unable to be placated: he was an implacable enemy of Ted's. ∎  relentless; unstoppable: the implacable advance of the enemy.DERIVATIVES: im·plac·a·bil·i·ty / -ˌplakəˈbilitē/ n.im·plac·a·bly / -blē/ adv.