Superlative form of brawny: most brawny.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "brawniest" in a sentence
"Were the largest jelly souls from the brawniest slaves?"
"Foremen acknowledged that they routinely allowed men to take breaks in the open air to recover from spells of light-headedness, and that even the hardiest and brawniest laborers suffered headaches and nausea that could incapacitate them for a full shift or even days on end."
"He distinguished himself by clotheslining the brawniest squab on the steamer as the fellow stepped over his sea bag."