1. With gusto and without reservation
   "the boy threw himself heartily into his work" 
2. In a hearty manner
   "'Yes,' the children chorused heartily"
   - cordially, warmly

See also: hearty

• keep in
• keep in line
• keep mum
• keep note
• keep off
• keep on
• keep one's distance
• keep one's eyes off
• keep one's eyes open
• keep one's eyes peeled
• keep one's eyes skinned
• keep one's hands off
• keep one's mouth shut
• keep one's nose to the grindstone
• keep one's shoulder to the wheel
• keep open
• keep out
• keep pace
• keep quiet
• keep step
• keep tabs on
• keep to oneself
• keep track
• keep up
• keep your shirt on