The Collaborative International Dictionary
Venial \Ve"ni*al\, a. [OF. venial, F. v['e]niel, L. venialis, from venia forgiveness, pardon, grace, favor, kindness; akin to venerari to venerate. See Venerate.]
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Capable of being forgiven; not heinous; excusable; pardonable; as, a venial fault or transgression.
So they do nothing, 't is a venial slip.
--Shak. -
Allowed; permitted. [Obs.] ``Permitting him the while venial discourse unblamed.''
--Milton.Venial sin (R. C. Theol.), a sin which weakens, but does not wholly destroy, sanctifying grace, as do mortal, or deadly, sins. [1913 Webster] -- Ve"ni*al*ly, adv. -- Ve"ni*al*ness, n.
--Bp. Hall.
Wiktionary
adv. In a venial manner.
Usage examples of "venially".
A man does not, however, incur ingratitude by committing a venial sin, because by sinning venially man does not act against God, but apart from Him, wherefore venial sins nowise cause the return of sins already forgiven.