Longman Dictionary of Contemporary English - compulsive

~ adj 1 compulsive behaviour is very difficult to stop or control, and is often a result of or a sign of a mental problem  (Compulsive spending is often a symptom of deep unhappiness.) 2 a compulsive liar/gambler/drinker etc someone who has such a strong desire to lie etc that they are unable to control it 3 a book, programme etc that is compulsive is so interesting that you cannot stop reading or watching it  (compulsive reading/viewing (=very interesting to read or watch))  (`Gardening World' - compulsive viewing for gardeners.) - compulsively adv - compulsiveness n