Source : Webster's Revised Unabridged Dictionary (1913)

Gluttonous \Glut"ton*ous\, a.
   Given to gluttony; eating to excess; indulging the appetite;
   voracious; as, a gluttonous age. -- {Glut"ton*ous*ly}, adv.
   -- {Glut"ton*ous*ness}, n.

Source : WordNet®

gluttonously
     adv : in a gluttonous manner; "this man eats gluttonously!"