unchallengeable

/ˈʌnˌtʃæləndʒəbəl/
IPA guide

Other forms: unchallengeably

Definitions of unchallengeable
  1. adjective
    not open to challenge
    “unchallengeable facts”
    “a position of unchallengeable supremacy”
    synonyms:
    noncontroversial, uncontroversial
    not likely to arouse controversy
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