We found one dictionary that defines the word smuggishly:

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1. smuggishly: Wiktionary

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