overslight

to accidently on purpose forget to invite or include someone, and if confronted, feign innocence, so they can't be too insulted.

I didn't invite her to my party, i know i should have, but it was an overslight.

alumniated

The euphoria one feels upon graduating from university or college. Short-felt elation, which disapates upon realizing you now need to 1) get a real job, 2) pay off your student loans.

When she graduated my sister was totally alumniated, until my parents asked her when she was going to start paying rent.