rustiness

from WordNet (r) 3.0 (2006)

rustiness
    n 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"

from The Collaborative International Dictionary of English v.0.48

Rustiness \Rust"i*ness\, n.
   The quality or state of being rusty.
   [1913 Webster]