Also means
spotless
Usage Note
Impec is a colloquial clipping of impeccable — used freely in informal spoken French to mean 'perfect', 'flawless', or simply 'great'. It is invariable in form (same for masculine, feminine, singular, plural). You might hear c'est impec! the way English speakers say 'spot on!' or 'perfect!'. It would be out of place in formal writing.
Examples
"Ton travail est vraiment impec."
Natural Translation
Your work is really perfect.
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