The Collaborative International Dictionary of English v.0.48:

Veniable \Ve"ni*a*ble\, a. [L. veniabilis, fr. venia
   forgiveness, pardon.]
   Venial; pardonable. [Obs.] --Sir T. Browne. -- Ve"ni*a*bly,
   adv. [Obs.] --Sir T. Browne.
   [1913 Webster]