Impassable
Pronunciation : Im*pass"a*ble
Part of Speech : a.
Etymology : [Cf. Unpassable.]
Definition : Defn: Incapable of being passed; not admitting a passage; as, an impassable road, mountain, or gulf. Milton. -- Im*pass"a*ble*ness, n. -- Im*pass"a*bly, adv.
Source : Webster's Unabridged Dictionary, 1913