Obsessive

Obsessive thoughts are ideas, pictures of thoughts or impulses, which repeatedly enter the mind.
Found on http://www.researchautism.net/glossary.ikml?l=o

obsessive

noun a person who has obsessions
Found on http://wordnetweb.princeton.edu/perl/webwn?s=obsessive

obsessive

obsessive 1. A reference to or characterized by obsession. 2. Relating to, characteristic of, or causing an obsession: 'She had an obsessive-gambling habit.' 3. Excessive in degree or nature: 'The coach had an obsessive need for his team to win.'
Found on http://www.wordinfo.info/words/index/info/view_unit/1928/2
No exact match found