In a demonstrable manner; so as to demonstrate; beyond the possibility of doubt; manifestly.

adverb. In a demonstrable manner; incontrovertibly; clearly.

adverb. In such a manner as to be capable of being demonstrated, shown or proved.

adverb. in an obvious and provable manner

"Unquestionably and demonstrably from the Latin word _dies_, in which, however, visibly there is not one letter the same as any one of the seven that are in journal."

clearly  incontrovertibly