obsessive

Prone to cause obsession.

• The idea is too tempting, it's obsessive.

Having one thought or pursuing one activity (an obsession) 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.

A person who is obsessed, who has an obsession.