Jejune means lacking in interest, nutrition or maturity, depending on the context.
Once I realized this jejune meal was all we would receive I began to worry in ernest about the arduous climb ahead.
I looked down upon his jejune interest in video games while a mere block away, the greatest of theaters beckoned.
From the Latin, ieiunus, meaning meager. (Leading Latin i’s are like the j in Jose).
(Source: wordnik.com)