irrefragable
adjective
ir·re·fra·ga·ble
i-ˈre-frə-gə-bəl
ˌi(r)-;
ˌir-i-ˈfra-gə-
1
: impossible to refute
irrefragable arguments
2
: impossible to break or alter
irrefragable rules
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Merriam-Webster unabridged
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