The Collaborative International Dictionary
Impeccability \Im*pec`ca*bil"i*ty\, n. [Cf. F. impeccabilit['e].] The quality of being impeccable; exemption from sin, error, or offense.
Infallibility and impeccability are two of his
attributes.
--Pope.
Wiktionary
n. The property of being impeccable.
Wikipedia
Impeccability is the absence of sin. Christianity teaches this to be an attribute of God (logically God cannot sin, it would mean that he would act against his own will and nature) and therefore it is also commonly, but not uncontroversially, attributed to Christ.
Usage examples of "impeccability".
It is, of course, a requirement within your own impeccability to learn the striations of emotions and boundaries that form these manifestations.
She seemed unreal in her gleaming impeccability, much like one of those Sung celadon vases that appear too flawless to have been thrown and glazed by human hands.
If the tests are met with commensurate ability and impeccability, then be bridges become increasingly bidirectional.
Relative to "pushing to the limit of impeccability," and the "petty tyrant" mode, it needs to be said (I believe) that all interactions provide counterchecks of self re impeccability.
Failing to act, extend oneself, to another in the situation where knowledge instructs that it is appropriate, then fails impeccability and any failure extracts a price.
In my own situation having medically flat-lined more than once, having travelled both volitionally and in clinical death to the third attention, having observed those who have completed their path and (for that matter) are allies in my quest, impeccability causes the drive to "continue".