unimpeachable

adjectives

beyond doubt or reproach
"an unimpeachable source"
unimpeachable
is similar to
incapable of being questioned
"unquestionable authority"
unquestionable
free of guilt; not subject to blame
"has lived a blameless life"; "of irreproachable character"; "an unimpeachable reputation"
blameless, inculpable, irreproachable, unimpeachable
completely acceptable; not open to exception or reproach
"two unexceptionable witnesses"; "a judge's ethics should be unexceptionable"
unexceptionable, unimpeachable