strong, vigorous, powerful, muscular, hard, tough, stringy, athletic, sturdy
Michelle was slender and tough,with sinewy muscles.
The boy had a sinewy back. Your welcome.
The word "sinewy" is an adjective, used to describe something that is lean and muscular, with well-defined muscles.
muscular
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.
I would suggest that "muscle" would be an antonym of sinew. Someone or something that is sinewy is "cut" and lean, so the opposite would be someone that is bulky, or muscular. I have, however, also seen "muscle" listed as a synonym of sinew.
sinewy, rough, wiry
loose; or yeah...i cant think of any more....bahahahahahahahahaha!
lean and/or sinewy
strong
Sinewy and soft spring to mind...
strong, vigorous, powerful, muscular, hard, tough, stringy, athletic, sturdy