blithely vs happily

blithely and happily both are adverbs.

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

As adverbs, blithely and happily are synonyms defined as:

Other synonyms of blithely include gayly, jubilantly, merrily, mirthfully.

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