unchallengeable
🇺🇸
/ʌnˈtʃælɪndʒəbl/
🇬🇧
/ʌnˈtʃælɪndʒəbl/
Something that is beyond doubt or cannot be disputed.
The expert's testimony was unchallengeable, leaving no room for doubt.
专家的证词毫无疑问,不留余地。