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. rustily adv. rustiness n.
[ OE rustig (as RUST) ]