From Longman Dictionary of Contemporary Englishje‧june/dʒɪˈdʒuːn/adjectiveformal1ideas that arejejuneare toosimplejejune political opinions2boringOriginjejune(1600-1700)Latinjejunus“not eating, (of food) small in amount”; influenced in meaning byFrenchjeune“young” ...
You won't get it from something jejune. The term comes to us from the Latin word jejunus, which means "empty of food," "hungry," or "meager." When English speakers first used jejune back in the 1600s, they applied it in ways that mirrored the meaning of its Latin parent, lamenting...
In common withalmuerzo, words for "breakfast" tend over time to shift in meaning toward "lunch;" compare Frenchdéjeuner"breakfast," later "lunch" (cognate of Spanishdesayuno"breakfast"), from Vulgar Latin*disieiunare"to breakfast," from Latindis-"apart, in a different direction from" +ieiu...