happy-go-lucky vs devil-may-care

happy-go-lucky and devil-may-care both are adjectives.

Word	Noun	Adjective	Verb	Adverb
happy-go-lucky	No	Yes	No	No
devil-may-care	No	Yes	No	No

As adjectives, happy-go-lucky and devil-may-care are synonyms defined as:

Other synonyms of happy-go-lucky include carefree, freewheeling, harum-scarum, slaphappy.

happy-go-lucky (adjective)	devil-may-care (adjective)
cheerfully irresponsible	cheerfully irresponsible
	marked by a carefree unconventionality or disreputableness