Unquestionable definition, not open to question; beyond doubt or dispute; indisputable; undeniable; certain: an unquestionable fact. See more. Thesaurus Translate Puzzles & Games Reference Word of the Day Blog Slideshows ...
un·ques·tion·a·ble (ŭn-kwĕs′chə-nə-bəl) adj. Beyond question or doubt. See Synonyms at authentic. un·ques′tion·a·bil′i·ty, un′ques′tion·a·ble·ness n. un·ques′tion·a·bly adv. unquestionable (ʌnˈkwɛstʃənəbəl) adj 1. indubitable or ...