Словарь синонимов английского языка - frivolous

(adj) 1. trifling, inconsequential, unimportant, trivial, nugatory, insignificant, minor, petty, paltry, niggling, peripheral, superficial, worthless, Colloq small-time, Brit twopenny, two a penny, US two-bit, penny-ante, nitty-gritty: Don't waste my time with frivolous details. 2. scatterbrained, bird-brained, silly, feather-brained, irresponsible, flippant, casual, flighty, giddy, foolish, childish, puerile; airy, light, slight, Brit airy-fairy, Colloq flip: Try to be serious and less frivolous about such important matters.