/ Dictionary / Index O obsessive: Meaning and Definition of Find definitions for: ob•ses•sive Pronunciation: (ub-ses'iv), [key] — adj. being, pertaining to, or resembling an obsession: an obsessive fear of illness. causing an obsession. excessive, esp. extremely so. —n. someone who has an obsession or obsessions; a person who thinks or behaves in an obsessive manner. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: obsessive (Thesaurus) obsession obsessive-compulsive Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language