See more synonyms for paranoid on
  1. a person suffering from paranoia.
Also par·a·noi·ac [par-uh-noi-ak, -ik] /ˌpær əˈnɔɪ æk, -ɪk/, par·a·noe·ac [par-uh-nee-ak, -ik] /ˌpær əˈni æk, -ɪk/.

Origin of paranoid

1900–05; paranoi(a) + -oid, with base and suffix merged, perhaps by haplology from the expected *paranoioid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for paranoid


Examples from the Web for paranoid

Contemporary Examples of paranoid

Historical Examples of paranoid

  • He was the one to blame; he'd known Dorflay's paranoid condition for years.

    Ministry of Disturbance

    Henry Beam Piper

  • But a paranoid Talent could think of them, and know that they were true.

    Talents, Incorporated

    William Fitzgerald Jenkins

  • He has all the tendencies to suspicion that a paranoid personality has.

    Talents, Incorporated

    William Fitzgerald Jenkins

  • Knowing this, they are also paranoid but, as distinct from the classic pathology, they do have enemies.

    After the Rain

    Sam Vaknin

  • Even if it's a paranoid constitutional inferior like Jimmy's father.

    The Syndic

    C.M. Kornbluth

British Dictionary definitions for paranoid


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

1901, irregularly formed from paranoia + -oid. As a noun, "a paranoid person," attested from 1922.

Online Etymology Dictionary, © 2010 Douglas Harper

paranoid in Medicine


  1. Relating to, characteristic of, or affected with paranoia.
  1. One affected with paranoia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.