1. superlative form of muscly; having the most muscle or the most prominent muscles
Usage: informal; comparative form is 'more muscly' or 'muscler'

Examples

• He was the muscliest guy at the gym.
• The muscliest athletes on the team were the linebackers.
• She became the muscliest version of herself after years of training.
• The muscliest superhero in the movie had impressive physique.
• Among all the competitors, he was the muscliest.