We found one dictionary that defines the word rattishly:

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1. rattishly: Wiktionary

Definitions from Wiktionary (rattishly) ▸ adverb:  In a rattish manner. ▸ Words similar to rattishly ▸ Usage examples for rattishly ▸ Idioms related to rattishly ▸ Wikipedia articles (New!) ▸ Words that often appear near rattishly ▸ Rhymes of rattishly ▸ Invented words related to rattishly