unpassable
- a incapable of being passed
- The idea had been initially dismissed by most economists and politicians as unpassable and unworkable, but lately it has shown some staying power.
- Because he was doing the thing on which, above all else, his heart and mind are set: to try to set the world on the pathway to better peace and to build an unpassable roadblock .
- But the 18 miles of water between Calais and the chalk cliffs of Dover justly retained its reputation as an unpassable rampart so long as Britain remained mistress of the seas.