Usage Note
Obsesivo can function as both adjective and noun: un obsesivo del orden ('someone obsessively tidy'). It frequently appears in clinical contexts (trastorno obsesivo-compulsivo, OCD) but is equally common in informal speech to describe intense fixations. The adverb form is obsesivamente.
Examples
"Es demasiado obsesivo con la limpieza."
Natural Translation
He is too obsessive about cleanliness.

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