acknowledged
beyond doubt
echt
for sure
genuine
indubitable
mathematical
unambiguous
unequivocal
unimpeachable
univocal
absolute
actual
admitting no question
ascertained
attested
authenticated
believable
bona fide
categorically true
certain
certified
clear
colorable
conceivable
conclusive
confirmable
confirmed
corroborated
credible
dead
deep-seated
definite
demonstrable
demonstratable
demonstrated
dependable
determined
documentary
effectual
esoteric
established
factual
fiduciary
flat
historical
immanent
implanted
implicit
inalienable
inappealable
incontestable
incontrovertible
indisputable
indwelling
infixed
astound
authentic
cogent
dubious
exceptional
intrinsic
self-evident
tangible
unalterable
unassailable
undeniable
undoubted
unmistakable
unquestioned
unquestioning
unswerving
questionable
ambiguous
conjectural
disputable