Sinew is the strong, stringy tissue in the body that connects muscles and bones, and sinewy is an adjective describing a tough, organic, stringy object. When describing a person or an animal, sinewy refers to a thin yet resilient appearance, where lean muscles and sinews are visible, with little or no body fat.
Photo Credit
"Wenceslas Hollar - Old man, clean shaven, prominent chin and a sinewy neck" by University of Toronto Wenceslaus Hollar Digital Collection is licensed under Public Domai.
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References
Merriam-Webster Online
2015 Sinewy. http://www.merriam-webster.com/dictionary/sinewy, accessed January 14, 2015.