psycho
UK /ˈsaɪ̯.kəʊ̯/ · US /ˈsaɪ̯.koʊ̯/ adjective, noun
Forms psychos syko
- adjective (colloquial or derogatory) Psychotic, psychopathic, or (broadly) otherwise insane.
- noun (chiefly derogatory, slang) A person who is psychotic, psychopathic, or (broadly) otherwise insane. “The loony bin up on the hill is full of psychos.”
- noun (chiefly derogatory, slang, loosely) 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.”
- noun (informal) A class, at a college or university, in which psychology is taught. “I've got anthro, socio, lunch, and psycho.”
Synonyms
freak loony nutcase wacko creep loose cannon weirdo psychotic psychotic person
Etymology
Clipping of psychotic or psychopath + -o (“person with characteristic”). Compare sicko.
Clipping of psychology.
Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “psycho”, CC BY-SA 4.0. Details