(adj) without fault or error, Syn. immaculate, impeccable, Example:faultless logic; speaks impeccable French; timing and technique were immaculate; an immaculate record
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
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. -- n. One who is impeccable; esp., one of a sect of Gnostic heretics who asserted their sinlessness. [ 1913 Webster ]
God is infallible, impeccable, and absolutely perfect. P. Skelton. [ 1913 Webster ]