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


  1. without flaw or error; faultlessan impeccable record
  2. rare incapable of sinning

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.

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