THESAURUS
corneous
bony, cement, cemental, concrete, dense, diamondlike, dure, flintlike, flinty, granitelike, granitic, hard, hard as nails, hardhearted, horny, iron-hard, ironlike, lapideous, lithoid, lithoidal, marble, marblelike, obdurate, osseous, resistant, resistive, rocklike, rocky, solid, steellike, steely, stonelike, stony, tough
ROGET THESAURUS
corneous
Hardness
N
hardness, rigidity, renitence, renitency, inflexibility, temper, callosity, durity, induration, petrifaction, lapidification, lapidescence, vitrification, ossification, crystallization, stone, pebble, flint, marble, rock, fossil, crag, crystal, quartz, granite, adamant, bone, cartilage, hardware, heart of oak, block, board, deal board, iron, steel, cast iron, decarbonized iron, wrought iron, nail, brick, concrete, cement, hard, rigid, stubborn, stiff, firm, starch, starched, stark, unbending, unlimber, unyielding, inflexible, tense, indurate, indurated, gritty, proof, adamant, adamantine, adamantean, concrete, stony, granitic, calculous, lithic, vitreous, horny,
corneous, bony, osseous, ossific, cartilaginous, hard as a rock, stiff as buckram, stiff as a poker, stiff as starch, stiff as as board.