adjective
EXAMPLES FROM OTHER ENTRIES
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unimpeachable statistical proof
EXAMPLES FROM CORPUS
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Avoid detached signatures, unless they are of extreme rarity and unimpeachable authenticity.
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But it gives Tom an unimpeachable alibi.
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Collectively its dedication, despite all difficulties, constituted an unimpeachable example.
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Its author has an unimpeachable pedigree: stories in the New Yorker, degrees from Stanford and Harvard.
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One person has wide and reliable knowledge of cars, as well as an unimpeachable moral character.
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She possessed unimpeachable status, for she was the Firstborn.
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So you devise a situation where an absolutely unimpeachable witness sees the murderer in black leaving the scene of the crime.