jejune in WordNet English dictionary

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