"rattiest" in the adjective sense
1. ratty
of or characteristic of rats
2. moth-eaten, ratty, shabby, tatty
showing signs of wear and tear
"a ratty old overcoat"
"shabby furniture"
"an old house with dirty windows and tatty curtains"
3. ratty
dirty and infested with rats
Source: WordNet® (An amazing lexical database of English)
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