"rustiest" in the adjective sense
1. rusty
covered with or consisting of rust
"a rusty machine"
"rusty deposits"
2. rust, rusty, rust-brown
of the brown color of rust
3. out of practice, rusty
impaired in skill by neglect
4. hoary, rusty
ancient
"hoary jokes"
Source: WordNet® (An amazing lexical database of English)
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