A rusty metal object such as a car or a machine is covered with rust, which is a brown substance that forms on iron or steel when it comes into contact with water.
...a rusty iron gate.
ADJ: usuADJn
2.
If a skill that you have or your knowledge of something is rusty, it is not as good as it used to be, because you have not used it for a long time.
You may be a little rusty, but past experience and teaching skills won't have been lost.
ADJ
3.
Rusty is sometimes used to describe things that are reddish-brown in colour.
ADJ
rusty
a.
1.
Covered with rust, affected with rust.
2.
Musty, fusty, mildewed, rubiginous.
3.
Dull, sluggish.
4.
Rough, hoarse, grating, unmusical.
Rusty
·superlRust-colored; dark.
II. Rusty·superl Surly; morose; crusty; sullen.
III. Rusty·superl Impaired by inaction, disuse, or neglect.
IV. Rusty·superl Discolored; stained; not cleanly kept; filthy.
V. Rusty·superl Discolored and rancid; reasty; as, rusty bacon.
VI. Rusty·superl Covered or affected with rust; as, a rusty knife or sword; rusty wheat.
VII. Rusty·superl Resembling, or covered with a substance resembling, rust; affected with rust; rubiginous.
Wikipédia
Rusty
Rusty may refer to something covered with rust or with a rust (color). Rusty is also a nickname for people who have red hair, have a rust-hued skin tone, or have the given name Russell.