English

Definition of unchallengeable adjective from the Oxford Advanced Learner's Dictionary

 

unchallengeable

 adjective
adjective
BrE BrE//ʌnˈtʃælɪndʒəbl//
 
; NAmE NAmE//ʌnˈtʃælɪndʒəbl//
 
 
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that cannot be questioned or argued with; that cannot be challenged unchallengeable evidence
See the Oxford Advanced American Dictionary entry: unchallengeable