"unimpeachable" in the adjective sense
1. unimpeachable
beyond doubt or reproach
"an unimpeachable source"
2. blameless, inculpable, irreproachable, unimpeachable
free of guilt not subject to blame
"has lived a blameless life"
"of irreproachable character"
"an unimpeachable reputation"
3. unexceptionable, unimpeachable
completely acceptable not open to exception or reproach
"two unexceptionable witnesses"
"a judge's ethics should be unexceptionable"
Source: WordNet® (An amazing lexical database of English)
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