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unimpeachable

adjective
 
 
/ˌʌn.ɪmˈpiː.tʃə.bl̩/ formal approving

Definition

of such a high standard of honesty and moral goodness that it cannot be doubted or criticized: Lord Fletcher, said the Bishop, was a man of unimpeachable integrity and character.Perfect and faultlessUnspoiltHonesty, openness and sincerity
(Definition of unimpeachable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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