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From Biology-Online Dictionary | Biology-Online Dictionary
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Not liable to sin; exempt from the possibility of doing wrong.

One who is impeccable; especially, one of a sect of Gnostic heretics who asserted their sinlessness. God is infallible, impeccable, and absolutely perfect. (P. Skelton)

Origin: L. Impeccabilis; pref. Im- not _ peccare to err, to sin: cf. F. Impeccable.