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Definitions

psychosis

[sahy-koh-sis] / saɪˈkoʊ sɪs /
NOUN
brainsickness
Synonyms
WEAK
craziness derangement insaneness lunacy madness mental disorder mental illness psychopathy unsoundness
NOUN
craziness
Synonyms
STRONGEST
insanity lunacy madness
STRONG
derangement insaneness psychopathy unsoundness
WEAK
brainsickness mental disorder mental illness
Antonyms
STRONGEST
sanity
NOUN
insaneness
Synonyms
STRONGEST
insanity
STRONG
aberration absurdity alienation craziness delirium delusion derangement distraction disturbance dotage folly frenzy hallucination hysteria illusion inanity irrationality irresponsibility lunacy madness mania neurosis phobia psychopathy senselessness unbalance
WEAK
brainsickness mental disorder mental illness preposterousness unreasonableness witlessness
Antonyms
STRONG
balance calm calmness certainty fact peace reality saneness truth
NOUN
insanity
Synonyms
STRONGEST
absurdity alienation craziness folly frenzy hysteria irresponsibility lunacy madness mental disorder
STRONG
aberration delirium delusion derangement distraction hallucination irrationality mania neurosis phobia psychopathy senselessness unbalance
WEAK
preposterousness unreasonableness witlessness
Antonyms
STRONG
balance certainty fact reality truth
WEAK
sanity soundness wellness
NOUN
lunacy
Synonyms
STRONGEST
absurdity folly foolishness idiocy insanity mania silliness stupidity
STRONG
aberration alienation asininity derangement distraction fatuity foolhardiness imbalance imbecility inanity ineptitude psychopathy senselessness
Antonyms
STRONGEST
intelligence judgment sense seriousness wisdom
WEAK
saneness
NOUN
madness
Synonyms
STRONGEST
absurdity craziness delusion foolishness hysteria lunacy mania mental illness stupidity
STRONG
aberration delirium derangement fanaticism irrationality neurosis phobia psychopathy unbalance
WEAK
mental disorder
Antonyms
STRONG
balance saneness sanity sense
NOUN
mental illness
Synonyms
STRONGEST
insanity mental disorder
WEAK
crack-up craziness delusions depression derangement disturbed mind emotional disorder emotional instability loss of mind lunacy madness maladjustment mania mental disease mental sickness nervous breakdown nervous disorder neurosis neurotic disorder paranoia phobia psychopathy sick mind troubled mind unbalanced mind unsoundness of mind
NOUN
psychopathy
Synonyms
STRONG
aberration absurdity alienation craziness delirium delusion derangement distraction disturbance dotage folly frenzy hallucination hysteria illusion inanity insaneness irrationality irresponsibility lunacy madness mania neurosis phobia senselessness unbalance
WEAK
brainsickness mental disorder mental illness preposterousness unreasonableness witlessness
Antonyms
STRONG
balance calm calmness certainty fact peace reality saneness truth

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

For years, researchers have proposed that psychosis may result from a reduced ability to update beliefs when new information becomes available.

From Science Daily • Apr. 3, 2026

There is a growing body of legal cases alleging AI-related harms, including psychosis External link, often citing heavy engagement with chatbots.

From Barron's • Mar. 26, 2026

Diagnosed with OCD and postpartum psychosis tendencies after giving birth, Sofii said she had "no idea" how unwell she was.

From BBC • Mar. 21, 2026

Experts say specialist support for postpartum psychosis is now available across Wales.

From BBC • Mar. 21, 2026

Tucker and I had exhausted the library’s databases on Scarlet and McCoy, with no further clues about McCoy’s particular brand of psychosis.

From "Made You Up" by Francesca Zappia

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.