Psychiatry. characterized by or afflicted with psychosis. (in nontechnical usage) insane, psychopathic, lunatic, mentally ill; mad, disturbed, deranged, demented, non compos mentis. sane; compos mentis, clearheaded, lucid.
Psychiatry. of or relating to psychosis: psychotic symptoms; psychotic delusion.
(loosely) mentally unstable: The man who threw a stone through the convenience store window must be psychotic. loony, crazy, nutty, nuts, bonkers; kooky, cuckoo, daft, batty, screwy, potty.
intensely upset, anxious, or angry; crazy: My dad gets so psychotic when I come home even a little bit late. crazed, furious, enraged, wrathful, irate, incensed, infuriated; livid, pissed off.
Psychiatry. a person afflicted with psychosis. (in nontechnical usage) psychopath, madman, maniac, lunatic.
(loosely) someone who is mentally unstable: I always cross the street when I have to go past that homeless shelter; it's full of psychotics. nut, kook, cuckoo, loony, loon.
someone who exhibits extreme emotion or behavior: My brother turns into a complete psychotic whenever his team loses. lunatic, maniac, psycho.

1885–85; psych(osis) + -otic

psychotically, adverb
nonpsychotic, adjective
semipsychotic, adjective
unpsychotic, adjective

neurotic, psychotic, schizophrenic, schizoid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psychotic (saɪˈkɒtɪk)
1.  of, relating to, or characterized by psychosis
2.  a person experiencing psychosis
usage  It is preferable to talk about a person experiencing psychosis rather than a psychotic, which reduces a person's individuality

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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Word Origin & History

1890, coined from psychosis, on the model of neurotic/neurosis, from Gk. psykhe- "mind, soul" (see psyche). The noun meaning "a psychotic person" is recorded from 1910.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

psychotic psy·chot·ic (sī-kŏt'ĭk)
Of, relating to, or affected by psychosis. n.
A person affected by psychosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
psychosis   (sī-kō'sĭs)  Pronunciation Key 
Plural psychoses (sī-kō'sēz)
A mental state caused by psychiatric or organic illness, characterized by a loss of contact with reality and an inability to think rationally. A psychotic person often behaves inappropriately and is incapable of normal social functioning.

psychotic adjective (sī-kŏt'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Antipsychotic drugs can help decrease or stop the psychotic symptoms and
  bizarre behavior.
In her sophomore year, she suffered a psychotic break and had to be
  hospitalized and to withdraw from college.
His elder brother suffered horribly and later became psychotic.
The drug elevates aggression levels and psychotic behavior, often generating
  fierce outbursts.
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