IPA: /ˈɡlʌtənəsli/
KK: /ˈɡlʌtənəsli/
In a way that shows excessive greed for food or indulgence.
He ate gluttonously at the buffet, piling his plate high with food.
Gluttonously → It is formed from "glutton" (from Old French *gloton*, meaning a person who eats excessively) and the suffix "-ously" (meaning in a manner characterized by). The word "gluttonously" describes the manner of eating excessively or greedily.
Think of someone who eats in a way that is characterized by excess — that's what gluttonously means.