Standard Lemma guide

psycho

adj · noun · 5 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Australian, UK: /ˈsaɪ̯.kəʊ̯/
  • Canada, US: /ˈsaɪ̯.koʊ̯/
  • Australia: Recorded audio is listed in the source snapshot.
  • rhymes with -aɪkəʊ
  • CMU ARPABET: S AY1 K OW0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Psychotic, psychopathic, or (broadly) otherwise insane.

Definition source: English Wiktionary via Wiktextract

Usage: colloquial, derogatory

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A person who is psychotic, psychopathic, or (broadly) otherwise insane.

Definition source: English Wiktionary via Wiktextract

Usage: derogatory, slang

Examples

  • The loony bin up on the hill is full of psychos.

Meaning relationships

Synonyms: freak, loony, nutcase, wacko

Antonyms: none provided

3

noun

Meaning 3

A person who acts in a bizarre or dangerous manner.

Definition source: English Wiktionary via Wiktextract

Usage: broadly, derogatory, slang

Examples

  • She complained that he was a psycho for driving at such a high speed in heavy traffic.

Meaning relationships

Synonyms: creep, freak, loose cannon, weirdo

Antonyms: none provided

4

noun

Meaning 4

A class, at a college or university, in which psychology is taught.

Definition source: English Wiktionary via Wiktextract

Usage: informal, uncountable

Examples

  • I've got anthro, socio, lunch, and psycho.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

a person afflicted with psychosis

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: psychotic, psychotic person

Antonyms: none provided

Broader terms: sick person, diseased person, sufferer

Narrower terms: cataleptic, paranoid, paranoiac, schizophrenic

History

Etymology

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

Clipping of psychology.

Across languages

Translations

45 source translations are retained for this English entry.

  • Danish: psyko — (colloquial or pejorative) Psychotic
  • Hebrew: פסיכי (psikhi) — (colloquial or pejorative) Psychotic
  • Indonesian: tak waras — (colloquial or pejorative) Psychotic
  • Interlingua: psychotic — (colloquial or pejorative) Psychotic
  • Interlingua: psychopathic — (colloquial or pejorative) Psychotic
  • Portuguese: psicótico — (colloquial or pejorative) Psychotic
  • Portuguese: psicopático — (colloquial or pejorative) Psychotic
  • Portuguese: louco — (colloquial or pejorative) Psychotic
  • Portuguese: psicopata — (colloquial or pejorative) Psychotic
  • Swedish: psykopatisk — (colloquial or pejorative) Psychotic
  • Swedish: tokig — (colloquial or pejorative) Psychotic
  • Swedish: vansinnig — (colloquial or pejorative) Psychotic
  • Bulgarian: психопат (psihopat) — psychotic or otherwise insane person
  • Chinese Mandarin: 精神病人 (jīngshénbìngrén) — psychotic or otherwise insane person
  • Chinese Mandarin: 精神病患者 (jīngshénbìnghuànzhě) — psychotic or otherwise insane person
  • Finnish: sekopää — psychotic or otherwise insane person
  • Finnish: kaistapää — psychotic or otherwise insane person
  • Finnish: psyko — psychotic or otherwise insane person
  • French: psychopathe — psychotic or otherwise insane person
  • German: Psycho — psychotic or otherwise insane person
  • German: Psychopath — psychotic or otherwise insane person
  • Hebrew: פסיכי (psikhi) — psychotic or otherwise insane person
  • Portuguese: psicopata — psychotic or otherwise insane person
  • Portuguese: psicótico — psychotic or otherwise insane person
  • Portuguese: louco — psychotic or otherwise insane person
  • Portuguese: doido — psychotic or otherwise insane person
  • Portuguese: insano — psychotic or otherwise insane person
  • Russian: псих (psix) — psychotic or otherwise insane person
  • Spanish: psicópata — psychotic or otherwise insane person
  • Swedish: psykfall — psychotic or otherwise insane person
  • Swedish: psyk — psychotic or otherwise insane person
  • Swedish: psyko — psychotic or otherwise insane person
  • Turkish: sayko — psychotic or otherwise insane person
  • Ottoman Turkish: دلی (deli) — psychotic or otherwise insane person
  • Chinese Cantonese: 黐線佬 /黐线佬 (ci1 sin3 lou2) — person acting in a bizarre or dangerous manner
  • Chinese Mandarin: 瘋子 /疯子 (fēngzi) — person acting in a bizarre or dangerous manner
  • Chinese Mandarin: 狂人 (kuángrén) — person acting in a bizarre or dangerous manner
  • Finnish: kaistapää — person acting in a bizarre or dangerous manner
  • German: Verrückte — person acting in a bizarre or dangerous manner
  • Greek: ψυχώ (psychó) — person acting in a bizarre or dangerous manner
  • Japanese: 狂人 (kyōjin) — person acting in a bizarre or dangerous manner
  • Portuguese: psicopata — person acting in a bizarre or dangerous manner
  • Portuguese: psicótico — person acting in a bizarre or dangerous manner
  • Russian: псих (psix) — person acting in a bizarre or dangerous manner
  • Swedish: galning — person acting in a bizarre or dangerous manner
Real reading context

psycho in complete knowledge articles