psy·chot·ic

[sahy-kot-ik]
adjective
1.
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.
2.
Psychiatry. of or relating to psychosis: psychotic symptoms; psychotic delusion.
3.
(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.
4.
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.
noun
5.
Psychiatry. a person afflicted with psychosis. (in nontechnical usage) psychopath, madman, maniac, lunatic.
6.
(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.
00:10
Psychotic is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
7.
someone who exhibits extreme emotion or behavior: My brother turns into a complete psychotic whenever his team loses. lunatic, maniac, psycho.

Origin:
1885–85; psych(osis) + -otic

psy·chot·i·cal·ly, adverb
non·psy·chot·ic, adjective
sem·i·psy·chot·ic, adjective
un·psy·chot·ic, adjective

neurotic, psychotic, schizophrenic, schizoid.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
psychotic (saɪˈkɒtɪk) [Click for IPA pronunciation guide]
 
adj
1.  of, relating to, or characterized by psychosis
 
n
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
 
psy'chotically
 
adv

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

psychotic
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)
adj.
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
Which makes me question the correlation between anti-social behavior and
  psychotic behavior.
The theories run the gamut ranging from personality disorders to affective
  disorders to psychotic disorders.
On one hand, he said, as a physician he wanted to be able to use everything
  available to help psychotic patients.
His elder brother suffered horribly and later became psychotic.
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