Longman Dictionary of Contemporary English homepage

unchallengeable

 adjective
     
un‧chal‧lenge‧a‧ble
1 a belief, idea etc that is unchallengeable is definitely true and cannot be questioned or argued with:
unchallengeable evidence
2 if someone's power or authority is unchallengeable, it cannot be taken from them
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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