impassable, navigable, unpassable, inaccessible, impassible, silted, treacherous, unusable, clogged, submerged, pathless, traversable, embanked, unchartered, crossable, unmapped, wadable, inviable, icebound, labyrinthian, uncharted, marshy, muddy, diked, impenetrable, untraveled, unuseable, unsalable, dammed, deltaic, overloaded, estuarial, unbridged, intracoastal waterway, unseaworthy, unsearchable, watery, mudflat, undistinguishable, perilous, unreachable, uncultivable, unmarketable, infeasible, waterlogged, unmanageable, unclimbable, unbreathable, windward passage, terra incognita, submersed, unploughed, landlocked, tsangpo, jumbled, intercoastal, saronic, graspable, inhospitable, occluded, dismissible, circuitous, uninviting, desolate, turbid, manmade, swimmable, gaillard cut, unfeasible, riverine, congested, swampy, spaghetti junction, twilit, bottlenecked, escapable, bridgeless, cluttered, hummock, masterless, mazelike, assailable, mucky, ungovernable, metalled, swamp, confusing, uneconomical, jungly, oligotrophic, serpentine, mona passage, conquerable, unfertile, unreadable, disjunct, lightless, gridlocked, convoluted, sinkage, passable, barren, flowing, unfrozen, frozen, shallower, unexplored, unfordable, placid, polluted, shallowest, unsurveyed, shallow