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Adjective: unchallengeable  `ún'cha-lin-ju-bul
  1. Not open to challenge
    "unchallengeable facts"; "a position of unchallengeable supremacy"

See also: noncontroversial, uncontroversial

Nearest

unceremoniously
unceremoniousness
uncertain
uncertainly
uncertainness
uncertainty
uncertainty principle
uncertified
unchain
unchained
unchallengeable
unchallenged
unchangeability
unchangeable
unchangeableness
unchangeably
unchanged
unchanging
unchangingness
unchaperoned
uncharacteristic