paranoid

[par-uh-noid]
adjective
1.
of, like, or suffering from paranoia.
noun
2.
a person suffering from paranoia.
Also, paranoiac [par-uh-noi-ak, -ik] , paranoeac [par-uh-nee-ak, -ik] .


Origin:
1900–05; paranoi(a) + -oid, with base and suffix merged, perhaps by haplology from the expected *paranoioid

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
paranoia (ˌpærəˈnɔɪə)
 
n
1.  a form of schizophrenia characterized by a slowly progressive deterioration of the personality, involving delusions and often hallucinations
2.  a mental disorder characterized by any of several types of delusions, in which the personality otherwise remains relatively intact
3.  informal intense fear or suspicion, esp when unfounded
 
[C19: via New Latin from Greek: frenzy, from paranoos distraught, from para-1 + noos mind]
 
paranoiac
 
adj, —n
 
paranoic
 
adj, —n

paranoid (ˈpærəˌnɔɪd)
 
adj
1.  of, characterized by, or resembling paranoia
2.  informal exhibiting undue suspicion, fear of persecution, etc
 
n
3.  a person who shows the behaviour patterns associated with paranoia

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

paranoid
1904, irregularly formed from paranoia + -oid. As a noun, "a paranoid person," attested from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

paranoiac par·a·noi·ac (pār'ə-noi'āk', -noi'ĭk)
n.
A paranoid. adj.
Of, relating to, or resembling paranoia.

paranoid par·a·noid (pār'ə-noid')
adj.
Relating to, characteristic of, or affected with paranoia. n.
One affected with paranoia.

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
The writer is officially diagnosed as a paranoiac schizophrenic, potentially dangerous.
Even this is a little cavalier for the true paranoiac, who avoids die in a handler because the system is out to get you.
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