Synonyms of 'sinewy'
muscularDictionary, strong, powerful
a short, sinewy young man
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An athletic person is fit, and able to perform energetic movements easily.
He was tall, with an athletic build.
Someone who is brawny is strong and has big muscles.
Oscar turned out to be a brawny young man.
If a person or their body is muscular, they are very fit and strong, and have firm muscles which are not covered with a lot of fat.
tanned muscular legs
Thesaurus for sinewy from the Collins English Thesaurus
Someone who is sinewy has a lean body with strong muscles .