1. the condition of being coated or clogged with rust • Derivationally related forms: rusty • Hypernyms: condition, status 2. ineptitude or awkwardness as a consequence of age or lack of practice - his rustiness showed when he was asked to speed up • Derivationally related forms: rusty • Hypernyms: awkwardness, clumsiness, ineptness, ineptitude, maladroitness, slowness