obsessive

[uhb-ses-iv]
adjective
1.
being, pertaining to, or resembling an obsession: an obsessive fear of illness.
2.
causing an obsession.
3.
excessive, especially extremely so.
noun
4.
someone who has an obsession or obsessions; a person who thinks or behaves in an obsessive manner.

Origin:
1910–15; obsess(ion) + -ive

obsessively, adverb
obsessiveness, noun
nonobsessive, adjective
nonobsessively, adverb
nonobsessiveness, noun
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World English Dictionary
obsessive (əbˈsɛsɪv)
 
adj
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
 
n
3.  psychiatry a person subject to obsession
4.  a person who is continually preoccupied with a particular activity, person, or thing
 
ob'sessively
 
adv
 
ob'sessiveness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

obsessive
formed 1911 from obsess + -ive. Related: Obsessively. Obsessive-compulsive is attested from 1927.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

obsessive ob·ses·sive (əb-sěs'ĭv, ŏb-)
adj.
Of, characteristic of, or causing an obsession.


ob·ses'sive n.
ob·ses'sive·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
My point is not that dogged persistence and obsessive research productivity
  eventually pay off.
Obsessive people are often difficult to work with, self absorbed and by the
  sound of things too tired to function properly.
Some scientists also suspect there might be physiological reasons for obsessive
  tanning, she said.
At last a glimpse of a forest dance floor reveals a weird, obsessive
  performance.
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