IMPECCABLE

impeccable. Impeccable, a. not subject to sin, perfect, pure

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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. — n. One who is impeccable; esp., one of a sect of Gnostic heretics who asserted their sinlessness.
God is infallible, impeccable, and absolutely perfect. P. Skelton.