happily vs happy

happily is not an adjective while happy is an adjective.

Word	Noun	Adjective	Verb	Adverb
happily	No	No	No	Yes
happy	No	Yes	No	No

happily (adjective)	happy (adjective)
	enjoying or showing or marked by joy or pleasure
	well expressed and to the point
	marked by good fortune
	eagerly disposed to act or to be of service

happily (adverb)	happy (adverb)
in an unexpectedly lucky way
in a joyous manner