Two shining arrogant eyes had established dominance over his face and gave him the appearance of always leaning aggressively forward. Not even the effeminate swank of his riding clothes could hide the enormous power of that body – he seemed to fill those glistening boots until he strained the top lacing, and you could see a great pack of muscle shifting when his shoulder moved under his thin coat. It was a body capable of enormous leverage – a cruel body.

F. Scott Fitzgerald

The Great Gatsby. Chapter 1, Nick on Tom Buchanan’s appearance. He is described as masculine, aggressive, and also dangerous. A man who could be violent, and in fact is.