incontestable
C2Adjektiv/US /ɪnkəˈntɛstəbəl/ ĭnkəˈntĕstəbəl; UK /ɪnkəˈntɛstəbəl/ ĭnkəˈntĕstəbəl/
Not contestable; not to be disputed; that cannot be called in question or controverted; incontrovertible; indisputable; as, incontestable evidence, truth, or facts.
