rustiest

adjective

1. 1.Marked or corroded by rust.
2. 2.Of the rust color, reddish or reddish-brown.
3. 3.Lacking recent experience, out of practice, especially with respect to a skill or activity.
4. 4.Of clothing, especially dark clothing: worn, shabby.
5. 5.Affected with the fungal plant disease called rust.