Ir`re·fut'a·ble adjective [ Latin irrefutabilis : confer French irréfutable . See Refute .] Incapable of being refuted or disproved; indisputable. -- Ir`re*fut'a*ble*ness , noun -- Ir`re*fut'a*bly , adverb Found on http://www.encyclo.co.uk/webster/I/97