Of something having the brown color of rust(adjective)
WordNet. Princeton University. 2010.
Use "rusty-brown" in a sentence
"And so convinced was Frona that she glanced involuntarily at St. Vincent's hands, and saw there the rusty-brown stains on the cuffs of his flannel shirt."
"He was a wall of a man with several tattoos daggers, naked broads, Foghorn Leghorn and a rusty-brown beard that sported tiny silver skull beads."
"The following slide showed the deck of the ship, littered with slaughtered bodies and tinged with the rusty-brown remains of a sea of blood."