Definition of obsessional adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//əbˈseʃənl//
; NAmE NAmE//əbˈseʃənl//
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thinking too much about one particular person or thing, in a way that is not normal She is obsessional about cleanliness. obsessional behaviour Perfectionist and obsessional thoughts can increase stress. They were receiving medical treatment for obsessional symptoms.
See the Oxford Advanced American Dictionary entry: obsessional