Synonyms and related words :
adhering, agglutinate, cartilaginous, chewy, cleaving, clinging, coherent, cohering, coriaceous, durable, fibrous, gristly, hard, hardy, holding together, impartible, indiscerptible, indissoluble, indissolvable, indivisible, infrangible, infusible, inseparable, insoluble, lasting, leatherlike, leathery, resistant, ropy, sinewy, sticking, stiff, stringy, strong, stubborn, stuck, tenacious, tough, tough as leather, undividable, unified, untiring, vigorous, viscid, wiry