Synonyms and related words :
abrasive, arenaceous, arenarious, arenose, brave, breccial, brecciated, bulldoggish, coarse, coarse-grained, courageous, craggy, cross-grained, crystal, crystalline, dauntless, determined, doughty, fearless, firm, game, gamy, grained, grainy, granular, granulate, granulated, gravelly, gross, gutsy, gutty, hardy, intrepid, lapideous, lithoid, lithoidal, mettlesome, monolithic, nervy, pebbled, pebbly, persistent, pertinacious, plucky, porphyritic, rasping, red-blooded, resolute, rock-ribbed, rock-strewn, rock-studded, rocklike, rocky, rough, sabulous, sandy, shingled, shingly, spirited, spiritful, spunky, stalwart, staunch, stonelike, stony, tenacious, tough, trachytic, unrefined, valorous