(1):
(superl.) Resembling, or covered with a substance resembling, rust; affected with rust; rubiginous.
(2):
(superl.) Covered or affected with rust; as, a rusty knife or sword; rusty wheat.
(3):
(superl.) Impaired by inaction, disuse, or neglect.
(4):
(superl.) Discolored and rancid; reasty; as, rusty bacon.
(5):
(superl.) Surly; morose; crusty; sullen.
(6):
(superl.) Rust-colored; dark.
(7):
(superl.) Discolored; stained; not cleanly kept; filthy.