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Adjective: sinewy  sin-yoo-ee
  1. Consisting of tendons or resembling a tendon
    - tendinous
  2. (of meat) full of sinews; especially impossible to chew
    - fibrous, stringy, unchewable
  3. (of a person) possessing physical strength and weight; rugged and powerful
    "a sinewy athlete";
    - brawny, hefty, muscular, powerful, muscly

See also: strong, tough