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obsessive-compulsive
adjective
designating or of a mental disorder, esp. a neurosis, characterized by compulsive thoughts or actions, irresistible urges, etc., that are unwanted and uncontrollable and interfere with work, social activity, and personal relationships, and often appear as repeated, somewhat ritualistic performances of certain acts
noun
a person who is obsessive-compulsive
See obsessive-compulsive in American Heritage Dictionary 4
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