ETYM as. rustig.
1. Affected by or as if by rust; especially; stiff with or as if with rust.
2. Inept and slow through lack of practice or old age.
3. Of the color rust; dulled in color or appearance by age and use.
4. Outmoded.
5. Hoarse, grating.
6. Covered with or consisting of rust.

Rust-colored; rusty.