(adj) free of guilt; not subject to blame, Syn. irreproachable, inculpable, unimpeachable, Example:has lived a blameless life; of irreproachable character; an unimpeachable reputation
(adj) completely acceptable; not open to exception or reproach, Syn. unimpeachable, Example:two unexceptionable witnesses; a judge's ethics should be unexceptionable
(adv) without question, Syn. unimpeachably, Example:Fred Winter is unquestionably the jockey to follow; they hired unimpeachably first-rate faculty members
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Not impeachable; not to be called in question; exempt from liability to accusation; free from stain, guilt, or fault; irreproachable; blameless; as, an unimpeachable reputation; unimpeachable testimony. Burke. -- Un`im*peach"a*ble*ness, n. -- Un`im*peach"a*bly, adv. [ 1913 Webster ]