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sinewy (adj.)

late 14c., "made of sinews," from sinew + -y (2). As "tough, stringy" from 1570s.

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Definitions of sinewy from WordNet

sinewy (adj.)
(of meat) full of sinews; especially impossible to chew;
Synonyms: fibrous / stringy / unchewable
sinewy (adj.)
consisting of tendons or resembling a tendon;
Synonyms: tendinous
sinewy (adj.)
(of a person) possessing physical strength and weight; rugged and powerful;
Synonyms: brawny / hefty / muscular / powerful
From wordnet.princeton.edu