faultless; flawless; irreproachable: impeccable manners.
not liable to sin; incapable of sin.

Origin of impeccable

First recorded in 1525–35, impeccable is from the Latin word impeccābilis faultless, sinless. See im-2, peccable
Related formsim·pec·ca·bil·i·ty, nounim·pec·ca·bly, adverb

Synonyms for impeccable Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for impeccably

Contemporary Examples of impeccably

Historical Examples of impeccably

  • Towards the girl and her father he was impeccably respectful.

    Out of the Depths

    Robert Ames Bennet

  • To be impeccably correct, initials should not be engraved on a visiting card.


    Emily Post

  • He selected a peak some ten miles away, and shot to it in a line which was impeccably straight.

  • The victims of the "accident," if there had really been any such, made no boast of it, and the dumb boy was impeccably discreet.

    The Surprises of Life

    Georges Clemenceau

  • But the Act as it stood, ignoring this vital change, was impeccably Conservative, and on that account went through.

British Dictionary definitions for impeccably



without flaw or error; faultlessan impeccable record
rare incapable of sinning
Derived Formsimpeccability, nounimpeccably, adverb

Word Origin for impeccable

C16: from Late Latin impeccābilis sinless, from Latin im- (not) + peccāre to sin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for impeccably



1530s, "not capable of sin," from Middle French impeccable (15c.) or directly from Late Latin impeccabilis "not liable to sin," from assimilated form of in- "not, opposite of" (see in- (1)) + pecare "to sin," of unknown origin. Meaning "faultless" is from 1610s. Related: Impeccably.

Online Etymology Dictionary, © 2010 Douglas Harper