Rusty is a word that describes something that has developed a red or brown coating because of the rusting process. There are many synonyms for the word rusty, including corroded, oxidized, patinated, eroded, tarnished, decayed, aged, weathered and worn out. Corroded describes metal that has been chemically damaged or dissolved, while oxidized refers to metal that has reacted with oxygen in the air to produce a rusted coating. Patinated describes the natural aging process of copper and bronze, while eroded is used to describe metal that has been worn away by friction. Tarnished describes metal that has lost its shine over time, and worn-out refers to metal that has reached the end of its useful life.