1) Capable of being overlooked 2) Easily excused or forgiven 3) French word used in English 4) Justifiable 1) Forgivable 2) Justifiable 3) Pardonable 
• (a.) That may be excused, forgiven, justified, or acquitted of blame; pardonable; as, the man is excusable; an excusable action.
Ex·cus'a·ble adjective [ Latin excusabilis : confer French excusable . See Excuse .] That may be excused, forgiven, justified, or acquitted of blame; pardonable; as, the man is excusable ; an excusable action. -- 
[adj] - capable of being overlooked 2. [adj] - easily excused or forgiven
forgivable adjective easily excused or forgiven; `a venial error`