A typically Donaldsonian word. I mean, why use ‘indisputable’ when ‘irrefragable’ will do? 

ir·ref·ra·ga·ble /ɪˈrɛfrəgəbəl/ [i-ref-ruh-guh-buhl]

adjective
not to be disputed or contested. 

[Origin: 1525–35; < LL irrefragābilis, equiv. to L ir- ir-2 + refragā() to resist, oppose + –bilis -ble]

Related forms
ir·ref·ra·ga·bil·i·ty, ir·ref·ra·ga·ble·ness, noun
ir·ref·ra·ga·bly, adverb

Source: Dictionary.com.

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