Definition from Wiktionary, the free dictionary
- Prone to cause obsession
- The idea is too tempting, it's obsessive
- Having one thought or pursuing one activity to the absolute or nearly absolute exclusion of all others.
- Hardcore fans' obsessive behavior may take over their lives
- Excessive, as results from obsession.
- A workaholic's obsessive zeal may lead to success or burnout
Derived terms 
Related terms 
having one thought or pursuing one activity to the absolute or nearly absolute exclusion of all others
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obsessive (plural obsessives)