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 impeccable

Contemporary Examples of impeccable

Historical Examples of impeccable

  • The impeccable character of the little house had been against it.


    Mary Roberts Rinehart

  • Your laundress will report on everything, you know; so you must be impeccable.

    The Fortune Hunter

    Louis Joseph Vance

  • How was that to be reconciled with impeccable deference to the ruling religion?

  • I think we could get the newscasts to see it as impeccable public behavior.

    Tinker's Dam

    Joseph Tinker

  • And what—if I may take the liberty—seeks our excellent and impeccable Gaul so far west?

    Doom Castle

    Neil Munro

British Dictionary definitions for impeccable



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 impeccable

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