I'm rather fond of the letter j, with its elegant tail and adorable dot, and this horrible word is not to be blamed on the twin j s.
Jejune (the j s are pronounced as in June, and the stress is on...well, mostly on the listener, but also on the second syllable).
It means simple, naive, dull, dry, insubstantial or barren. There we are: six much more usable words than the ghastly jejune.
The facts are simple: use the word jejune and everyone will hate you.
Word Not To Use Today: jejune. This word crept into the language in the 1600s, presumably whilst all sensible people were looking the other way. It comes from the Latin word jējūnus, which means hungry or empty.