unchallengeable
🇺🇸
/ʌnˈtʃælɪndʒəbl/
🇬🇧
/ʌnˈtʃælɪndʒəbl/
Something that is beyond doubt or cannot be disputed.
The expert's testimony was unchallengeable, leaving no room for doubt.
専門家の証言は反論の余地がなく、疑う余地を残しませんでした。