Entry 1 sense Webster, 1913 Undoubted · Un·doubt·ed · IPA /ʌnˈdaʊtɪd/ 01 a. Not doubted; not called in question; indubitable; indisputable; as, undoubted proof; undoubted hero. 1. Not doubted; not called in question; indubitable; indisputable; as, undoubted proof; undoubted hero.