Etymology
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jejune (adj.)

1610s, "dull in the mind, flat, insipid, wanting in interest," from Latin ieiunus "empty, dry, barren," literally "fasting, hungry," a word of obscure origin. De Vaan finds it to be from a PIE root meaning "to worship, reverence," hence "to sacrifice" (with cognates including Sanskrit yajati "to honor, worship, sacrifice," Avestan yaza- "to worship," Greek agios, agnos "holy;" see hagio-), and writes that the Latin word and its relatives "would be based on the habit to perform the first sacrifice of the day on an empty stomach." Related: jejunal; jejunally.

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Definitions of jejune

jejune (adj.)
of insufficient quantity to meet a need;
the jejune diets of the very poor
Synonyms: inadequate / poor / short
jejune (adj.)
displaying or suggesting a lack of maturity;
jejune responses to our problems
Synonyms: adolescent / juvenile / puerile
jejune (adj.)
lacking interest or significance or impact;
jejune novel
Synonyms: insipid
From wordnet.princeton.edu