impassable Synonyms

unpassable tightly packed mothproof no-go nonopening soundproof all-conquering unattackable unbeatable watertight bulletproof unbridgeable unlivable unapproachable airtight wayless unsurmountable unpenetrable deadend undefeatable unnavigable unpiercable without exit without egress leading nowhere closed at one end untrodden untrod untraversable untravellable unrealizable unpierceable uninjectable unfeasible unattainable unachievable unscalable unreachable unconquerable uncomeatable impracticably impracticable impossible imporous impervious imperviable impermeable imperforate impenetrable impassive