'Rustiness' definitions:

Definition of 'rustiness'

From: WordNet
noun
The condition of being coated or clogged with rust
noun
Ineptitude or awkwardness as a consequence of age or lack of practice; "his rustiness showed when he was asked to speed up"

Definition of 'Rustiness'

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