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серьёзный adj. stresses
gen.	sólido (JIZM); circunspecto; circunspeto; grave (о болезни и т.п.); ponderado; ponderoso; sério; severo; sisudo
Braz.	prêto
серьёзно adv.
gen.	de cuidado; sério

серьёзно: 5 phrases in 2 subjects

General	4
Informal	1