Im*pec"ca*ble (?), a. [L. impeccabilis; pref. im- not + peccare to err, to sin: cf. F. impeccable.]
Not liable to sin; exempt from the possibility of doing wrong.
One who is impeccable; esp., one of a sect of Gnostic heretics who asserted their sinlessness.
God is infallible, impeccable, and absolutely perfect.
© Webster 1913.