D defs.my
Entry 2 senses Webster, 1913

Heartily

/(härt"ĭ*ly̆)/ · Heart·i·ly · IPA /ˈhɑɹtɪli/
01 adv. From the heart; with all the heart; with sincerity.
  1. 1.
    From the heart; with all the heart; with sincerity.
    “I heartily forgive them.” Shak.
  2. 2.
    With zeal; actively; vigorously; willingly; cordially; as, he heartily assisted the prince.
Phrases & compounds
To eat heartily — to eat freely and with relish.