I think that immaturity is worse personally.<br><br>
And while moodiness is pretty bad, it could be indicative of troubles outside of work, or lack of self-confidence.<br><br>
If someone is consistantly moody on an ongoing basis, coupled with other traits of immaturity- such as pettiness, playing politics, bullying, etc... you have to sit down with them they have to get along with their co-workers better.