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как ни в чём не бывало stresses
gen.	deftly (Побеdа); nonchalantly (Alex_Odeychuk); just as if nothing had happened; matter-of-factly (Enrica); undisturbed (scherfas); like nothing even happened (42admirer); as if nothing had happened; nonchalant (4uzhoj); as if nothing happened
Gruzovik, inf.	as if nothing had happened; as if nothing were wrong
idiom.	as sound as a bell (Andrey Truhachev); sweep under the carpet (Yeldar Azanbayev); under wraps (Yeldar Azanbayev); keep something under one's hat (Yeldar Azanbayev); as cool as a cucumber (ART Vancouver)
proverb	none the worse for (one's experience, пр.)

как ни в чём не бывало: 7 phrases in 3 subjects

General	4
Informal	2
Makarov	1