FRIVOLOUS Meaning of FRIVOLOUS in English adj.1 paltry, trifling, trumpery. 2 lacking seriousness; given to trifling; silly. Derivatives: frivolity n. (pl. -ies). frivolously adv. frivolousness n. Etymology: L frivolus silly, trifling Oxford English vocab. Оксфордский английский словарь. 2012