The Open Dictionary

obsessive

noun

UK/əbˈses.ɪv/
US/əbˈses.ɪv/

Definitions of obsessive noun

  1. Countable

    a person who has an obsession or is affected by obsessive thoughts

adjective

UK/əbˈses.ɪv/
US/əbˈses.ɪv/

Definitions of obsessive adjective

  1. C2

    preoccupied with a single topic, activity, or person to an excessive degree

    • She is obsessive about collecting antique dolls.

    • He is obsessive about his weight.

    • The artist had an obsessive attention to detail.

  2. related to or characteristic of an obsession, often implying an unhealthy or excessive nature

    • They had an obsessive relationship with each other.

    • He has an obsessive need to organize everything perfectly.

    • This obsessive behavior with cleaning has impacted his daily life.