IPA: /ˈɡlʌtənəsnəs/
KK: /ˈɡlʌtənəsnəs/
The state or quality of being excessively greedy or indulging in food and drink.
His gluttonousness was evident at the buffet, where he piled his plate high with food.
Gluttonousness → It is formed from "glutton" (from Old French *gloton*, meaning one who eats excessively) and the suffix "-ous" (meaning full of) combined with "-ness" (meaning the state of being). The word "gluttonousness" refers to the state of being full of excessive eating or greediness.
Think of someone who is 'full of' ('-ous') excessive eating ('glutton') — that's why gluttonousness means the state of being greedy in eating.