jejune adj. + Add to list US //ˌdʒɛˈdʒun// UK //dʒˈɛdʒjuːn// je·june Archaic SynonymsEtymology Synonyms adolescentinsipidinsubstantialjuvenilepuerileOriginLATiēiūnus→ENjejune Borrowed from Latin iēiūnus (“fasting”).