gluttonly
Resembling or characteristic of a glutton.
All five then began a system of begging and gluttonly eating which need not be described.
Where it comes from
From glutton + -ly. The adverb is attested in Middle English as glotonliche, glotonly, glotounliche (“voraciously, greedily”).
Adapted from the Wiktionary entry gluttonly (CC BY-SA 4.0).