Sinewy

a.	1.	Pertaining to, consisting of, or resembling, a sinew or sinews. The sinewy thread my brain lets fall. - Donne.
	2.	Well braced with, or as if with, sinews; nervous; vigorous; strong; firm; tough; as, the sinewy Ajax. A man whose words . . . were so close and sinewy. - Hare.

Adj.	1.	sinewy - (of meat) full of sinews; especially impossible to chew Synonyms: unchewable, fibrous, stringy
	2.	sinewy - consisting of tendons or resembling a tendon Synonyms: tendinous
	3.	sinewy - (of a person) possessing physical strength and weight; rugged and powerful; "a hefty athlete"; "a muscular boxer"; "powerful arms" Synonyms: brawny, hefty, muscular, powerful

able-bodied, acid, athletic, biting, brawny, broad-shouldered, burly, cartilaginous, chewy, cohesive, coriaceous, corrosive, cutting, driving, durable, effective, fibrous, forceful, forcible, gristly, gutsy, hard, hardy, imperative, impressive, incisive, lasting, leatherlike, leathery, mighty, mordant, muscle-bound, muscular, nervous, penetrating, piercing, poignant, powerful, punchy, resistant, robust, ropy, sensational, sinewed, slashing, stiff, stout, strapping, striking, stringy, strong, stubborn, sturdy, telling, tenacious, thewy, thickset, tough, tough as leather, trenchant, untiring, vigorous, viscid, vital, well-built, well-knit, well-set, well-set-up, wiry