rusty

adj. (-ier, -iest) 1 rusted or affected by rust. 2 stiff with age or disuse. 3 (of knowledge etc.) Impaired, esp. By neglect (my french is rusty). 4 rust-coloured. 5 (of black clothes) discoloured by age.  rustiness n.

superl. Covered or affected with rust; as, a rusty knife or sword; rusty wheat.