demonstrable

demonstrable adjective absolute, apparent, assured, beyond a question, beyond all doubt, clear, clear-cut, decided, definite, dependable, determinate, doubtless, established, evident, incontestable, indisputable, indubitable, not to be disputed, positive, stable, trustworthy, unequivocal, unimpeachable, unmistakable, unqualified, unquestionable, valid, veracious, without doubt, workable

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See also: actual, ascertainable, certain, cogent, concrete, convincing, corporeal, de facto, deductible, definite, genuine, incontrovertible, indubious, irrefutable, positive, provable, undeniable