No, the word 'impeccable' is an adjective, a word to describe a noun as in accordance with the highest standards of propriety; faultless. For example:
impeccable manners
an impeccable kitchen
The noun form for the adjective impeccable is impeccability.
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Ryans Spanish pronounciation was impeccable.
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Impeccable Blahs was created on 2006-07-25.
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When anything is impeccable, it means that no fault can be found in it - it is perfect. So impeccable logic is logic that is perfectly correct and valid and cannot be refuted