say it: HAHR-tuh-lee
heartily is an adverb meaning "with gusto and without reservation". It carries 2 recorded senses.
with gusto and without reservation
“the boy threw himself heartily into his work”
Definitions, synonyms and semantic relations for heartily come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.