Definition of incontestable adjective from the Oxford Advanced American Dictionary

     

    incontestable

     adjective
    adjective
    NAmE//ˌɪnkənˈtɛstəbl//
     
    (formal)
     
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  1. 1that is true and cannot be disagreed with or denied synonym indisputable
  2. 2 an incontestable right/fact His claim to the land is incontestable.
incontestably
 
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NAmE//ˌɪnkənˈtɛstəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: incontestable