Venial

Ve"ni*al (?), a. [OF. venial, F. véniel, L. venialis, from venia forgiveness, pardon, grace, favor, kindness; akin to venerari to venerate. See Venerate.] 1. Capable of being forgiven; not heinous; excusable; pardonable; as, a venial fault or transgression.

So they do nothing, 't is a venial slip.
Shak.

2. 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.

-- Ve"ni*al*ly, adv. -- Ve"ni*al*ness, n. Bp. Hall.