English Reference
adjective · noun

psychotic

adj. · n.
US /ˌsaɪˈkɑtɪk/ UK /saɪkˈɒtɪk/ psy·chot·ic UK spelling psychotics

  1. 01 C1 Advanced Technical Medicine

    adj.suffering from a mental illness that makes it hard to tell what is real and what is not.

    adj.relating to or suffering from psychosis, a severe mental disorder in which thought and emotions are so impaired that contact is lost with external reality.

    Simple

    The patient was in a psychotic state and believed he was a famous king.

    In context

    Clinical observation revealed that the subject was experiencing a psychotic episode characterized by auditory hallucinations and fragmented thought patterns.

    Usage

    Often used with the noun 'episode' or 'break'.

  2. 02 C2 Proficiency Informal

    adj.behaving in a very strange, wild, or dangerous way.

    adj.exhibiting erratic, irrational, or bizarre behaviour that appears out of control.

    Simple

    The driver was acting totally psychotic, weaving in and out of traffic.

    In context

    Her ex-boyfriend started sending psychotic messages at three in the morning, demanding to know where she was.

    Teacher's tip

    This sense is common in casual speech but can be seen as insensitive to those with actual mental health conditions.

  3. 03 C2 Proficiency Technical Medicine

    n.a person who is suffering from a serious mental illness called psychosis.

    n.a person affected by psychosis. This usage is increasingly avoided in clinical settings in favour of person-first language.

    Simple

    The doctor explained how to provide care for a psychotic in a crisis.

    In context

    Early twentieth-century texts often referred to the patient as a psychotic rather than a person suffering from a specific disorder.

    Teacher's tip

    Modern medical professionals prefer 'person with psychosis' over using the adjective as a noun.

They also endure psychotic symptoms, such as hearing voices that aren't there.

BBC News· 19 Aug 2026

A Jerusalem court said the Jewish attacker was having a psychotic episode when he assaulted the nun, in an incident which caused outrage.

BBC News· 27 Aug 2026

Derived in English from psychosis + -tic; compare French psychotique, German psychotisch. Attested from the late 19th century. Compare earlier neurotic.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level C1 · Advanced
Frequency Frequent
Updated