insignificancy, exiguity, flippancy, giddiness, hoity-toity, indifference, insignificance, levity, lightness, minuteness, nonchalance, ridicule, triviality, carelessness, laughableness, ridiculousness, negligibility, thoughtlessness, unimportance
НЕСЕРЬЕЗНОСТЬ
Русско-английский перевод НЕСЕРЬЕЗНОСТЬ
Русско-Английский словарь общей тематики. Russian-English dictionary of general subjects. 2012