obsessive-compulsive

adjective

1. of or relating to a personality style characterized by perfectionism, indecision, conscientiousness, concern with detail, rigidity, and inhibition.
2. Psychiatry. of or relating to a neurosis characterized by persistent intrusion of unwanted thoughts (obsessions) or the performance of actions, as repeated hand-washing, that one is unable to stop (compulsions).

noun

3. a person having such a personality style.

adj.

1. Having a tendency to dwell on unwanted thoughts or perform certain repetitious rituals, especially as a defense against anxiety from unconscious conflicts.

n.

1. A person who exhibits obsessive-compulsive behavior.