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невозмутимость n stresses
gen.	equanimity; ataraxy; immovability; sedateness; calmness; tranquillity; impassivity (Dim); calm (человека); inscrutability (Oleg Nashchekin); stolidity (Interex); dead-pan; nonchalance (в контексте Рина Грант); aplomb (VLZ_58); dispassionateness; ataraxia; imperviousness (Ремедиос_П); stillness (Abysslooker); sereneness; serenity
Gruzovik	coolness
Игорь Миг	ownership of self; self possession; self restraint
book.	imperturbability; imperturbation
fr.	sangfroid
humor.	unflappability
inf.	cool
Makarov.	calm
obs.	serenitude; unamazedness; undisturbedness
poetic	serene (Aly19)
slang	rind
uncom.	indisturbance

невозмутимость: 20 phrases in 3 subjects

General	10
Idiomatic	2
Makarov	8