American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
His behavior had always been impeccable, the only exception being when he was involved in a violent incident when he was trying to prevent a killing behind bars.— The Devil's Bedpost
Its name, in impeccable Spanglish, is— VERBATIM: The Language Quarterly Vol II No 3
Impeccable has been looked up 307 times, favorited once, listed 23 times, and commented on 0 times.

American Heritage Dictionary (1)
Century Dictionary (1)
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