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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World English Dictionary
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
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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

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
As always, I was paranoid and very caucious.
The deeper we got into the forest, the more paranoid and frightened Roger got.
Ask people whether they're paranoid, and most say they're not.
One who suffers from paranoia is paranoid.
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