From Longman Dictionary of Contemporary Englisheat heartilyeat heartilyLOT/VERY MUCHto eat a large amount → heartily
Examples from the Corpus
eat heartily• Stephen took several and ate heartily.• Aunt Tossie, now in the full regalia of her widow's weeds, was eating heartily but in a subdued way.• We ate heartily every night, we could afford croissants at breakfast, and we stopped scrounging for cigarettes.• He always ate heartily on these occasions.• All through the meal he picked at his food, while Peter ate heartily with a quip about being a condemned man. 