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English definition of “unimpeachable”

unimpeachable

adjective uk   /ˌʌn.ɪmˈpiː.tʃə.bl̩/ formal approving us  
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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