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беззаботный adj. stresses
gen.	careless; easy-going; light-hearted; unconcerned; neglectful; devil-may-care; easygoing; fancy-free; free-minded; happy-go-lucky; harum-scarum; insouciant; rollicking; uncareful; unthoughtful; breezy; lightsome; reckless; happy as a sand-boy; jolly as a sand-boy; lighthearted; forgetful; happy as a sandboy (о человеке); heedless; jolly as a sandboy (о человеке); merry as a sandboy (о человеке); saucy; vacant; dizzy (alia20); fiesty (Aly19); worry-free (Anglophile); idyllic (Екатерина Лебедева); fancy free; free minded; happy go lucky; harum scarum; cavalier (Aiduza); free-spirited (proz.com owant); air-headed (Le Kokoro); marked by peace and comfort; relaxed; devil-may-carish (Anglophile); devil may care; easy going; casual (VLZ_58); easy (4uzhoj); carefree ("Hello?"  she put on her most pleasant, carefree voice.); carefree; nonchalant (He looked nonchalant enough as he strolled along the Bayswater Road, but inwardly Creed was a mess of nerves.); devil may care (attitude Taras); devil-may-care (attitude Taras); insouciantly (bigmaxus); care-defying; free from care; mindless; secure; seely; thoughtless; touch-and-go
Gruzovik	untroubled
amer.	laid-back (a laid-back way of living Val_Ships)
Makarov.	airy; free from cares
med.	complacent (DoctorKto)
mineral.	spalt
obs.	wretchless
relig.	easeful
slang	off the hook; high, wide, and handsome (Interex); la-di-dah (Interex); lah-di-dah (Interex)
беззаботно adv.
gen.	airily; light-heartedly; carelessly; breezily (SvetlanaC); in a care-free manner (Anglophile); blithely (Оли Гогелиа); light heartedly; unconcernedly (AnastasyaTheLinguist); merrily (veterok11); idly (VLZ_58); heedlessly (Olya34); nonchalantly (shergilov); lightly (Abysslooker); insouciantly (bigmaxus); securely; smack smooth; thoughtlessly; in a carefree manner; without a care; botherlessly (nsnews.com Alex_Odeychuk)
idiom.	without a care in the world (There's no shorage of expensive restaurants, bars and cafes in these luxury neughbourhoods where these rich kids can spend their parents' money and live their lives without a care in the world. – жить без забот / беззаботно ART Vancouver)
obs.	forgetfully; regardlessly
slang	wide and handsome high

беззаботный: 53 phrases in 9 subjects

Advertising	1
American usage, not spelling	1
General	29
Humorous / Jocular	1
Idiomatic	5
Informal	1
Makarov	9
Slang	4
Sublime	2