1. faultless; flawless; irreproachable: impeccable manners.
2. not liable to sin; incapable of sin.
See more synonyms on Thesaurus.com
1. unassailable, unexceptionable.
precise, unblemished, exquisite, immaculate, accurate, aces, clean, correct, exact, faultless, infallible, innocent, irreproachable, nice, perfect, pure, right, sinless, stainless, unerring
Origin: 1525–35; < Latin impeccabilis faultless, sinless. See im- , peccable
EXAMPLES FROM THE WEB FOR IMPECCABLE
Le Monde once called his résumé "so impeccable that it's almost discouraging."
THIS SCARY-SMART NEW MINISTER OF ECONOMY MIGHT JUST TURN FRANCE AROUND|TRACY MCNICOLL|AUGUST 31, 2014|DAILY BEAST
Two Rivers functions like a fanboy gift shop with impeccable replica items.
WOULD-BE CONGRESSMAN CAN’T QUIT SADDAM|GIDEON RESNICK|JUNE 27, 2014|DAILY BEAST
Also back is that impeccable writing, packed with all the weird, wonderful one-liners that fans fell in love with last season.
‘ORANGE IS THE NEW BLACK’ SEASON TWO IS MORE BINGEWORTHY THAN THE FIRST|KEVIN FALLON|MAY 16, 2014|DAILY BEAST
So how do blazers, trousers, and pointed-toe flats an “impeccable dress sense” make?
ANNE HIDALGO, PARIS’S FIRST FEMALE MAYOR, ISN’T A FASHIONISTA…AND THAT’S QUITE ALL RIGHT|ERIN CUNNINGHAM|APRIL 17, 2014|DAILY BEAST
This was the world of Gustave H. our narrator assumes, one of refinement, poise, and impeccable service.
WES ANDERSON’S AUSTRIAN MUSE: STEFAN ZWEIG|LUCY SCHOLES|FEBRUARY 26, 2014|DAILY BEAST
With the final touch added for an appearance in a company, she still looked dainty, certainly of impeccable grooming.
THE EDDY|CLARENCE L. CULLEN
Impeccable, im-pek′a-bl, adj. not liable to error or to sin.
CHAMBERS'S TWENTIETH CENTURY DICTIONARY (PART 2 OF 4: E-M)|VARIOUS
Rastignac beholding himself well dressed and impeccable as to gloves and boots, forgot his virtuous resolutions.
FATHER GORIOT|HONORE DE BALZAC
And let me urge that impeccable mundane splendor, despite facile arguments to the contrary, is a very real and worthy achievement.
YOUR UNITED STATES|ARNOLD BENNETT
It was really comical to think of that impeccable person as a receiver of stolen property.