D defs.my
Entry 2 senses Webster, 1913

Unquestionable

/ən-kwĕs'-chən-əb-əl/ · Un·ques·tion·a·ble · IPA /ʌnˈkwɛs.t͡ʃən.ə.bl̩/
01 a. Not questionable; as, an unquestionable title.
  1. 1.
    Not questionable; as, an unquestionable title.
  2. 2.
    Not inviting questions or conversation.[R.]