1. (adj)insubstantial, jejune lacking in nutritive value "the jejune diets of the very poor"
2. (adj)adolescent, jejune, juvenile, puerile displaying or suggesting a lack of maturity "adolescent insecurity"; "jejune responses to our problems"; "their behavior was juvenile"; "puerile jokes"
3. (adj)insipid, jejune lacking interest or significance or impact "an insipid personality"; "jejune novel"