1. (adj)unimpeachable beyond doubt or reproach "an unimpeachable source"
2. (adj)blameless, inculpable, irreproachable, unimpeachable free of guilt; not subject to blame "has lived a blameless life"; "of irreproachable character"; "an unimpeachable reputation"
3. (adj)unexceptionable, unimpeachable completely acceptable; not open to exception or reproach "two unexceptionable witnesses"; "a judge's ethics should be unexceptionable"
Definition of 'unimpeachable'
