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несерьёзность n stresses
gen.	futility; flippancy; thoughtlessness (Tony19); lack of seriousness (Yanamahan); facetiousness (ArthurAN); levity; carelessness; exiguity
Gruzovik	unfoundedness; lightness; frivolity; unimportance
fig.	shallowness (george serebryakov)
psychol.	superficialism