Adjective

• 1. lacking in nutritive value;

  "the jejune diets of the very poor"

• 2. displaying or suggesting a lack of maturity;

  "adolescent insecurity"

  "jejune responses to our problems"

  "their behavior was juvenile"

  "puerile jokes"

• 3. lacking interest or significance;

  "an insipid personality"

  "jejune novel"