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Noun: rustiness  rú-stee-nus
  1. The condition of being coated or clogged with rust
  2. Ineptitude or awkwardness as a consequence of age or lack of practice
    "his rustiness showed when he was asked to speed up"

Type of: awkwardness, cack-handedness [Brit], clumsiness, condition, ineptitude, ineptness, maladroitness, slowness, status