We found one dictionary that defines the word rattishness:

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1. rattishness: Wiktionary

Definitions from Wiktionary (rattishness) ▸ noun:  The quality of being rattish. ▸ Words similar to rattishness ▸ Usage examples for rattishness ▸ Idioms related to rattishness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing rattishness ▸ Words that often appear near rattishness ▸ Rhymes of rattishness ▸ Invented words related to rattishness