Trifling, a.
Being of small value or importance; trivial; paltry; as, a trifling debt; a trifling affair. -- Tri"fling*ly, adv. -- Tri"fling*ness, n.
Shades of meaning
Fernald has no entry of its own for trifling; he lists it under idle, vain.
He lists it without comment; the entries above explain its neighbors.
Synonyms
idlevainabortivebaselessbootlessdeceitfuldelusiveemptyfruitlessfutileinactiveinconstantindolentineffectualinertlazynugatorynullprofitlessshadowyslothfulsluggishtrivialunavailingunemployedunimportantunoccupiedunprofitableunrealunsatisfyingunserviceableunsubstantialuselessvacantvapidvisionaryworthless