jejune \juh-JOON\, adjective:
1. Lacking in nutritive value.
2. Displaying or suggesting a lack of maturity; childish.
3. Lacking interest or significance; dull; meager; dry.
By the inflection of his voice, the expression of his face, and the motion of his body, he signals that he is aware of all the ways he may be thought silly or jejune, and that he might even think so himself.
-- Jedediah Purdy, For Common Things