rough·cast / ˈrəfˌkast/ • n. plaster of lime, cement, and gravel, used on outside walls.• adj. 1. (of a building or part of a building) coated with roughcast: a plain stone building, roughcast and whitewashed.2. (of a person) lacking refinement: she thought of the roughcast yeomen she would meet.• v. [tr.] (usu. be roughcast) coat (a wall) with roughcast: the walls were to have been roughcast at the entrance bay.

roughcast. Species of external plastering or render composed of lime, sand, water, and small particles of gravel, pebbles, or crushed stones, thrown on to an undercoat of render before the latter has dried, also called pebble-dash, slapdash, or wetdash. See also harling.