adjective, noun
adjective
thinking too much about one particular person or thing; showing this: He's becoming more and more obsessive about punctuality. ◆ an obsessive attention to detail ◆ obsessive behaviour / love
obsessively adverb: obsessively jealous ◆ He worries obsessively about his appearance.
noun (psychology) a person whose mind is filled with thoughts of one particular thing or person so that they cannot think of anything else.
Example sentence:
The psychiatrist have to do a lot of work with obsessive.