[rusty] adj rust.i.er ; -est (bef. 12c) 1: affected by or as if by rust; esp: stiff with or as if with rust
2: inept and slow through lack of practice or old age 3 a: of the color rust b: dulled in color or appearance by age and use "a ~ old suit of clothes"
4: outmoded
5: hoarse, grating -- rust.i.ly adv -- rust.i.ness n
[2]rus.ty adj rus.ti.er ; -est [alter. of restive] (1625) chiefly dial: ill-natured, surly