Another facet is to be fed up by something. A too much or too often of information, work, etc. can evoke boredom. It is in some ways the opposite of deprivation. But is has a similar symptom.

As we are attracted by diversion, we get an aversion against too much of one thing.

This is maybe where boredom comes from nowadays. Since we are set out to more and more stimulation and information, it is just logical that our brain sometimes needs some rest.