adverb
Etymology: Middle English, from fat (II) + -ly
1. : richly , luxuriantly
a fatly prosperous landscape
2. : in the manner of one that is fat
walking fatly down the road — Claud Cockburn
turned fatly and looked at him — William Faulkner
3. : smugly , complacently
any of the reasons usually given so patly and fatly — Sinclair Lewis