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беспечно adv. stresses
gen.	blithely (Anglophile); light heartedly; with complete unconcern; gaily (Igor_M); off-handedly (Andrey Truhachev); offhandedly (Andrey Truhachev); lightly; light-heartedly; carelessly; negligently; harum-scarum (Alex_No_Chat); jauntily; thoughtlessly (Minnesota); complacently (dissenter); nonchalantly (shergilov); idly; perfunctorily; incautiously; inconsiderately; indolently; in a carefree manner; without a care; unwarily; unconcernedly; supinely; breezily (Abysslooker)
Игорь Миг	recklessly
Makarov.	airily
беспечный adj.
gen.	careless; reckless; carefree; jaunty; negligent; nonchalant; thoughtless; unguarded; devil-may-care; easygoing; happy-go-lucky; inapprehensive; uncareful; unheedful; unthoughtful; watchless; blithe; incautious; light-hearted; devoid of cares; volatile; unworried; giddy-pated (Anglophile); flippant (Aly19); mindless (Баян); happy go lucky; light hearted; lightsome; light; unmindful; cavalier (having or showing no concern for something that is important or serious – см. merriam-webster.com Aiduza); casual; heedless (Баян); birdbrained; devil-may-carish (Anglophile); devil may care; easy going; unthinking; laid-back (VLZ_58); easy-going (см. Difficulties En-Ru для ABBYY Lingvo x5 и Краткий словарь трудностей английского языка. От текста к контексту / Валерий Сергеевич Модестов. © "Русский язык–Медиа", 2008 ssn); unconcerned; rocked in security; slaphappy; harum-scarum (Alex_No_Chat); free minded; giddy headed; giddy brained; idle; indolent; supine; undiligent; unheeding
Gruzovik	airy (superficial, light-hearted)
amer.	arrogant (Val_Ships)
avia.	inadvertent
fig.	slack
fr.	laissez-faire (a policy or attitude of letting things take their own course, without interfering. "a laissez-faire attitude to life" (Oxford Dictionary): For more than a dozen years, the municipality refused to issue debentures to finance improvements. Roads often followed the construction of housing. This laissez-faire atmosphere drove frustrated West Side residents to secede and form the Municipality of Point Grey in 1906. (Harold Kalman) ART Vancouver)
inf.	slapdash
obs.	gay; retchless; uncautious
poetic	blithesome
slang	flakey; flaky; hummy

беспечно: 61 phrases in 11 subjects

Advertising	2
American usage, not spelling	1
Automobiles	2
Bookish / literary	1
Chess	1
Cinematography	1
General	21
Law	1
Makarov	28
Slang	2
Vulgar	1