obsessive

The definition of obsessive is fixated on something.

(adjective)

An example of an obsessive person is someone who needs to count his shirts every day.

Obsessive is defined as a person who has excessive thoughts or actions.

(noun)

An example of an obsessive is a person who constantly thinks about death.

See obsessive in Webster's New World College Dictionary

adjective

of, having the nature of, or causing an obsession or obsessions

noun

a person who has obsessive thoughts

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See obsessive in American Heritage Dictionary 4

adjective

Of, relating to, characteristic of, or causing an obsession: obsessive gambling.
Excessive in degree or nature: an obsessive need to win.

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