Welcome to UsingEnglish.com, iguemmah!
When I see a word marked with "disapproving", I think the word is used to show disapproval, whose meaning is on http://www.ldoceonline.com/dictionary/disapproval
I am not a teacher.
When I check the dictionary for unfamiliar words, I come across given hints, which show the connotative use of the target word, i.e. formal, informal, archaic, etc. But, I sometimes run into "DISAPPROVING". This is an example from Oxford Advanced Learner's Dictionary:
( disapproving )
behaving towards other people as if you think you are better than they are
My question: WHAT DOES "DISAPPROVING" IN THIS REGARD MEAN?
I agree with Matthew- the word is being used to show that the speaker thinks negatively about this characteristic.