na-adjective
compulsive
Describes behavior, thoughts, or urges that feel driven and hard to control, often in psychological or everyday contexts.
彼は強迫的に手を洗う。
He washes his hands compulsively.
強迫的な考えが頭から離れない。
Compulsive thoughts won't leave my mind.
強迫観念 is a noun meaning 'obsession' or 'compulsive idea', often used in clinical contexts.
Formed from 強迫 (compulsion) + 的 (-like, -ive), a standard pattern for creating adjectival nouns.