We found one dictionary that defines the word gluttonishly:

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1. gluttonishly: Wiktionary

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