I don't like these abnormally dull days. They're kind of unnerving, in an impossible to describe way.
Speaking of impossible to describe. It's also impossible to describe why it is the way it is. X_X
Nothing can be abnormally dull. Dullness is the natural state of all things.
Come to think of it. Not dull means changing. Changing means energy. The universe itself wants the less energy possible to be spent.
It's the opposite that's abnormal. Nerdish probably, but it techinically works in everyday life as well.