Michelle was slender and tough,with sinewy muscles.
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The boy had a sinewy back. Your welcome.
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The word "sinewy" is an adjective, used to describe something that is lean and muscular, with well-defined muscles.
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muscular
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Pertaining to, consisting of, or resembling, a sinew or sinews.,
Well braced with, or as if with, sinews; nervous; vigorous; strong; firm; tough; as, the sinewy Ajax.