— impassability, impassableness , n. — impassably , adv.
/im pas"euh beuhl, -pah"seuh-/ , adj.
1. not passable; not allowing passage over, through, along, etc.: Heavy snow made the roads impassable.
2. unable to be surmounted: an impassable obstacle to further negotiations.
3. (of currency) unable to be circulated: He tore the bill in half, making it impassable.
[ 1560-70; IM- 2 + PASSABLE ]