hallucinate
C1Formal; medical/clinical; can be used in informal contexts when discussing drugs or extreme states.
Definition
Meaning
To experience perceptions (seeing, hearing, etc.) of things that are not physically present.
To perceive something that appears real but is created by the mind, often due to mental disorder, drugs, fever, or extreme fatigue. Can be used figuratively to mean 'to imagine vividly' or 'to have a strong but mistaken impression'.
Linguistics
Semantic Notes
Typically implies a perceptual event, not just a false belief. The verb is more common than the noun 'hallucination' in formal medical descriptions ('the patient hallucinates').
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage.
Connotations
Commonly associated with psychosis, psychedelic drugs, and delirium in both varieties.
Frequency
Slightly higher frequency in American English likely due to greater public discourse on drug culture and mental health.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subj] hallucinates[Subj] hallucinates [Obj: something/that.../seeing...][Subj] hallucinates [Adv: wildly/vividly]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “'You must be hallucinating!' (expression of strong disbelief)”
- “'See pink elephants' (humorous idiom for hallucinating from alcohol)”
Usage
Context Usage
Business
Rare; potentially used figuratively: 'After reviewing the projections, I thought I was hallucinating—they were so unrealistic.'
Academic
Common in psychology, psychiatry, and neuroscience literature to describe a symptom of various disorders.
Everyday
Used to describe experiences with fever, extreme tiredness, or drug use. 'I was so sleep-deprived I started hallucinating.'
Technical
Core term in clinical diagnosis (e.g., schizophrenia, substance-induced psychotic disorder).
Examples
By Part of Speech
verb
British English
- The patient began to hallucinate voices in the empty room.
- After 36 hours without sleep, he started hallucinating spiders on the wall.
- She was hallucinating vividly from the high fever.
American English
- The medication can cause some people to hallucinate.
- Under extreme stress, she hallucinated that the walls were closing in.
- They claimed to hallucinate patterns in the static.
adverb
British English
- Not standardly used. 'Hallucinatorily' exists but is extremely rare and non-standard.
American English
- Not standardly used.
adjective
British English
- The hallucinating patient required immediate sedation.
- He was found in a hallucinating state, speaking to nobody.
American English
- A hallucinating individual may act on false perceptions.
- She was clearly hallucinating and in no state to drive.
Examples
By CEFR Level
- He saw things that weren't there. He was hallucinating.
- People with high fevers sometimes hallucinate.
- She thought she saw a ghost, but she was just hallucinating.
- The powerful drug caused him to hallucinate vividly, seeing swirling colours and hearing music.
- Extreme sleep deprivation can make even healthy people hallucinate.
- The psychiatrist noted that the patient would often hallucinate accusatory voices, a common symptom in his condition.
- Some indigenous rituals involve ingesting plants that make participants hallucinate as part of a spiritual journey.
Learning
Memory Aids
Mnemonic
Imagine a HALL where you see a LUCINATE (sounds like 'loony mate')—your 'crazy friend' is seeing things that aren't there in the hall.
Conceptual Metaphor
THE MIND IS A THEATRE / THE MIND IS A PROJECTOR (it creates and shows its own images).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'галлюцинировать' (direct cognate, correct). Avoid using 'видеть галлюцинации' as a verb phrase; the verb itself suffices. The Russian word can sound overly clinical in casual contexts where English might use 'see things'.
Common Mistakes
- Incorrect: 'I hallucinated to see a dragon.' Correct: 'I hallucinated a dragon.' or 'I hallucinated seeing a dragon.'
- Confusing 'hallucinate' (perceive unreal things) with 'delude' (hold false beliefs).
Practice
Quiz
Which of the following is the closest in meaning to 'hallucinate'?
FAQ
Frequently Asked Questions
A hallucination is a false sensory perception (seeing, hearing). A delusion is a false belief (thinking you are Napoleon).
Yes, severe sleep deprivation is a well-documented cause of hallucinations.
No, it can apply to any sense: auditory (hearing voices), olfactory (smelling things), tactile (feeling bugs on skin), etc.
Yes, it is grammatically correct, e.g., 'I hallucinated that the painting was moving.'