The Collaborative International Dictionary of English v.0.48:
Forgivable \For*giv"a*ble\, a. Capable of being forgiven; pardonable; venial. --Sherwood. [1913 Webster]WordNet (r) 3.0 (2006):
forgivable adj 1: easily excused or forgiven; "a venial error" [syn: excusable, forgivable, venial]