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obsessive

[uh b-ses-iv]
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adjective
  1. being, pertaining to, or resembling an obsession: an obsessive fear of illness.
  2. causing an obsession.
  3. excessive, especially extremely so.
noun
  1. someone who has an obsession or obsessions; a person who thinks or behaves in an obsessive manner.

Origin of obsessive

First recorded in 1910–15; obsess(ion) + -ive
Related formsob·ses·sive·ly, adverbob·ses·sive·ness, nounnon·ob·ses·sive, adjectivenon·ob·ses·sive·ly, adverbnon·ob·ses·sive·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for obsessiveness

obsessive

adjective
  1. psychiatry motivated by a persistent overriding idea or impulse, often associated with anxiety and mental illness
  2. continually preoccupied with a particular activity, person, or thing
noun
  1. psychiatry a person subject to obsession
  2. a person who is continually preoccupied with a particular activity, person, or thing
Derived Formsobsessively, adverbobsessiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for obsessiveness

obsessive

adj.

1911, from obsess + -ive. Related: Obsessively. Obsessive-compulsive is attested from 1927.

Online Etymology Dictionary, © 2010 Douglas Harper

obsessiveness in Medicine

obsessive

(əb-sĕsĭv, ŏb-)
adj.
  1. Of, characteristic of, or causing an obsession.
Related formsob•sessive n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.