Something so obviously true or real that it cannot be argued against or proven false.
Composed of the prefix 'un-' (not) plus 'deniable' (from Old French 'denir,' to deny, from Latin 'denegare'). The compound entered English in the 1600s.
Ironically, what we call 'undeniable' often depends on perspective—even facts that seem irrefutable (like evolution or climate change) get denied, showing that 'undeniable' really means 'undeniable to reasonable people.'
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