Trafficable is an adjective used to describe a surface or route that can be used for traffic or transportation. Antonyms for trafficable include impassable, impenetrable, obstructed, and closed. Imassable suggests that a surface or route is unable to be crossed, especially due to physical barriers such as rocks, water, or difficult terrain. Impenetrable means that something cannot be entered or crossed, often due to a dense obstacle or barrier such as a wall or thicket. Obstructed suggests that a surface or route is blocked or hindered, often due to an external object or barrier. Finally, closed indicates that a surface or route is not accessible or open to traffic.