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ENGLISH · A WORD WITH POSSIBILITIES

psycho.

Psychotic, psychopathic, or (broadly) otherwise insane.

6 characters2 syllables approx.English language

Meaning & usage

adj/ˈsaɪ̯.kəʊ̯/Australia, UK/ˈsaɪ̯.koʊ̯/Canada, US
  1. Psychotic, psychopathic, or (broadly) otherwise insane.

    colloquial · derogatory
Where this word comes from

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

noun/ˈsaɪ̯.kəʊ̯/Australia, UK/ˈsaɪ̯.koʊ̯/Canada, US
  1. A person who is psychotic, psychopathic, or (broadly) otherwise insane.

    derogatory · slang
    The loony bin up on the hill is full of psychos.
  2. A person who acts in a bizarre or dangerous manner.

    broadly · derogatory · slang
    She complained that he was a psycho for driving at such a high speed in heavy traffic.
Where this word comes from

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

noun/ˈsaɪ̯.kəʊ̯/Australia, UK/ˈsaɪ̯.koʊ̯/Canada, US
  1. A class, at a college or university, in which psychology is taught.

    informal · uncountable
    I've got anthro, socio, lunch, and psycho.
Where this word comes from

Clipping of psychology.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.