Definitions for unchallengeable
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Random House Webster's College Dictionary
un•chal′lenge•a•ble(adj.; adv.)-bly
Princeton's WordNet
unchallengeable(adj)
not open to challenge
"unchallengeable facts"; "a position of unchallengeable supremacy"
Wiktionary
unchallengeable(Adjective)
Not open to challenge; indisputable
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"unchallengeable." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/unchallengeable>.