psycho

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psycho¹

  • /ˈsaɪ̯.kəʊ̯/ Australia, UK
  • /ˈsaɪ̯.koʊ̯/ Canada, US

Rhymes with -aɪkəʊ

Where it comes from

Clipping of psychotic or psychopath + -o (“person with characteristic”). Compare sicko.

adjective more psycho · most psycho · syko

  1. colloquial, derogatory Psychotic, psychopathic, or (broadly) otherwise insane. That psycho jawn had snuck a pistol into the gym while we was practicing and started shooting shit up like she was some kinda hot female action hero.

noun psychos · syko

  1. derogatory, slang A person who is psychotic, psychopathic, or (broadly) otherwise insane. The loony bin up on the hill is full of psychos.

    Similar: freak, loony, nutcase, wacko

  2. broadly, derogatory, slang A person who acts in a bizarre or dangerous manner. She complained that he was a psycho for driving at such a high speed in heavy traffic.

    Similar: creep, freak, loose cannon, weirdo

psycho²

  • /ˈsaɪ̯.kəʊ̯/ Australia, UK
  • /ˈsaɪ̯.koʊ̯/ Canada, US

Rhymes with -aɪkəʊ

Where it comes from

Clipping of psychology.

noun syko

  1. informal, uncountable A class, at a college or university, in which psychology is taught. I've got anthro, socio, lunch, and psycho.

Thesaurus

Closest in meaning: psychotic, psychotic person, lunatic, screwy, mad, crazy, loony, nutcase, crackpot, craze, insane, wacko, deranged, crazed, madman, kooky

Translations

Every language

adj (colloquial or pejorative) Psychotic

Portuguêspsicótico, psicopático, louco, psicopata
Deutschpsycho
עבריתפסיכי psikhi

noun psychotic or otherwise insane person

Españolpsicópata
中文精神病人 jīngshénbìngrén, 精神病患者 jīngshénbìnghuànzhě
Portuguêspsicopata, psicótico, louco, doido, insano
Françaispsychopathe
DeutschPsycho, Psychopath
Русскийпсих psix
עבריתפסיכי psikhi

noun person acting in a bizarre or dangerous manner

日本語狂人 kyōjin
中文瘋子 /疯子 fēngzi, 狂人 kuángrén
Portuguêspsicopata, psicótico
DeutschVerrückte
Ελληνικάψυχώ psychó
Русскийпсих psix

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Cite this
MLA

"psycho." Wiktionary, via Micwyn, micwyn.com/word/psycho. Accessed 6 Nov. 2026.

APA

psycho. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/psycho

Chicago

"psycho." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/psycho.

BibTeX
@misc{psycho_2026,
  title = {psycho},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/psycho},
  urldate = {2026-11-06}
}