(adj): suitable for rough use
(adj): substantially made or constructed
(adj): vs. unfurrowed), rugged -- (having long narrow shallow depressions (as grooves or wrinkles) in the surface
(adj): having thin parallel channels
(adj): shaped into alternating parallel grooves and ridges
(adj): full of ruts
(adj): topographically very uneven
(adj): vs. smooth), unsmooth -- (having or caused by an irregular surface
(adj): very difficult; severely testing stamina or resolution
(adj): vs. easy), hard -- (not easy; requiring great physical or mental effort to accomplish or comprehend or endure