obvious
absolute
actual
admitting no question
apparent
axiomatic
clear
clear as crystal
clear-cut
confirmable
crystal-clear
definite
demonstrable
demonstratable
discernible
distinct
evident
explicit
express
factual
historical
inappealable
incontestable
incontrovertible
indisputable
indubitable
inescapable
irrefragable
irrefutable
manifest
noticeable
observable
open-and-shut
palpable
patent
perceivable
perceptible
perspicuous
plain
plain as day
provable
proverbial
real
seeable
self-explaining
self-explanatory
tangible
testable
self-evidence
analogous
averse
believable
conclusive
immutable
impervious
innocuous
intelligible
logical
paradoxical
plausible
straightforward
unanswerable
unassailable
undeniable
undisputed
unimportant
valueless