delusional

[ dih-loo-zhuh-nl ]
/ dɪˈlu ʒə nl /

adjective

having false or unrealistic beliefs or opinions: Senators who think they will get agreement on a comprehensive tax bill are delusional.
Psychiatry. maintaining fixed false beliefs even when confronted with facts, usually as a result of mental illness: He was so delusional and paranoid that he thought everybody was conspiring against him.
Sometimes de·lu·sion·ar·y.

Words nearby delusional

deluge, delusion, delusion of grandeur, delusion of negation, delusion of persecution, delusional, delusive, delusterant, delustering, deluxe, delvaux

Definition for delusionary (2 of 2)

delusion
[ dih-loo-zhuhn ]
/ dɪˈlu ʒən /

noun

an act or instance of deluding.
the state of being deluded.
a false belief or opinion: delusions of grandeur.
Psychiatry. a fixed false belief that is resistant to reason or confrontation with actual fact: a paranoid delusion.

Origin of delusion

1375–1425; late Middle English < Latin dēlūsiōn- (stem of dēlūsiō), equivalent to dēlūs(us) (past participle of dēlūdere; see delude) + -iōn- -ion

SYNONYMS FOR delusion

1 deception. See illusion.

OTHER WORDS FROM delusion

de·lu·sion·al, de·lu·sion·ar·y, adjective pre·de·lu·sion, noun

WORDS THAT MAY BE CONFUSED WITH delusion

allusion delusion elusion hallucination illusion (see synonym study at illusion)

British Dictionary definitions for delusionary

delusion
/ (dɪˈluːʒən) /

noun

a mistaken or misleading opinion, idea, belief, etc he has delusions of grandeur
psychiatry a belief held in the face of evidence to the contrary, that is resistant to all reason See also illusion, hallucination
the act of deluding or state of being deluded

Derived forms of delusion

Medical definitions for delusionary

delusion
[ dĭ-lōō′zhən ]

n.

A false belief strongly held in spite of invalidating evidence, especially as a symptom of mental illness.

Other words from delusion

de•lu′sion•al adj.

Scientific definitions for delusionary

delusion
[ dĭ-lōō′zhən ]

A false belief or perception strongly held in spite of invalidating evidence, especially as a symptom of mental illness, as in schizophrenia.

Cultural definitions for delusionary

delusion

A false belief held despite strong evidence against it; self-deception. Delusions are common in some forms of psychosis. Because of his delusions, the literary character Don Quixote attacks a windmill, thinking it is a giant.