adj. (rustier, rustiest)
1. rusted or affected by rust.
2 stiff with age or disuse.
3 (of knowledge etc.) faded or impaired by neglect (my French is a bit rusty).
4 rust-coloured.
5 (of black clothes) discoloured by age.
6 a of antiquated appearance. b antiquated or behind the times.
7 (of a voice) croaking or creaking.
Derivatives:
rustily adv. rustiness n.
Etymology: OE rustig (as RUST)