sinewy

adj

1.
(of meat) full of sinews; especially impossible to chew
fibrous stringy unchewable
2.
consisting of tendons or resembling a tendon
sinewous tendinous
Pertainym:
sinew
Derived from:
sinew
3.
(of a person) possessing physical strength and weight; rugged and powerful
brawny hefty muscular powerful
Derived from:
sinew