2 definitions found From WordNet (r) 2.0 [wn]: impassable adjective: impossible to pass [syn: {unpassable}] [ant: {passable}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Impassable \Im*pass"a*ble\, adjective [Cf. {Unpassable}.] Incapable of being passed; not admitting a passage; as, an impassable road, mountain, or gulf. --Milton. -- {Im*pass"a*ble*ness}, noun -- {Im*pass"a*bly}, adverb

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