/ ˌɪnkənˈtestəbl; NAmE / adjective
( formal ) that is true and cannot be disagreed with or denied
SYN indisputable :
an incontestable right / fact
► in·con·test·ably / -əbli; NAmE / adverb
••
WORD ORIGIN
late 17th cent.: from French , or from medieval Latin incontestabilis , from in- not + contestabilis able to be called upon in witness, from the verb contestari (from con- together + testare to witness).