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labor under the delusion of/that

To live, operate, or function with the unyielding belief in something, especially that which is fanciful, unrealistic, or untrue. Primarily heard in US. Jeremy's always labored under the delusion of being a great writer, even though he's never written more than a few crummy poems. No one likes paying taxes, but those who would call for them to be done away with altogether are laboring under the delusion that our society can function without them!
See also: delusion, labor, of, that

delusions of grandeur

Unrealistic beliefs about the amount of power and influence one has. You're just an intern, so you definitely have delusions of grandeur if you think the boss is going to listen to you!
See also: delusion, of

delusions of grandeur

a false impression of your own importance.
This expression is the equivalent of the French phrase folie de grandeur , which came into English in the late 19th century and is still used today.
See also: delusion, of

delusions of ˈgrandeur

(often humorous) a belief that you are more important than you really are: He’s been suffering from delusions of grandeur ever since he became manager.
See also: delusion, of
References in periodicals archive ?
1) The second sister probably escaped the delusional disorder as she was educated, had friends, and married.
For cases of primary delusional infestation, the goal generally is to decrease the patient's preoccupation with the delusion and to improve social and occupational functions.
Although patients with delusional disorder and those with schizophrenia both have delusions, the delusions of the latter typically are bizarre and unlikely to be possible.
11] While the frequency of major delusional themes is stable over longer periods, the specific shape of this content, for example "who is the persecutor," "what is the reason for the persecution," mainly depends on actual developments.
But we are so unaccustomed to people resigning from any position, that whoever does so must be a delusional megalomaniac.
Approximately 5%-15% of patients with delusional infestations will exhibit delusions shared with a spouse or relative (folie a deux) or shared with more than one family member or close friend (folie partage).
Rosiello was suffering from both a delusional disorder and cocaine-dependency disorder on the night in question and substantially lacked the capacity to form the requisite intent for a first-degree murder conviction.
Judge Griffith-Jones observed that although delusional behaviour detailed in a psychiatric report did not mitigate the attack, it showed the context in which Richardson felt there was some justifi-cation for feeling bitterness.
Delusional was published by Pineapple Press and is available at local bookstores for $14.
Responding to Assad's remarks, Hague said: "This will go down as one of the most delusional interviews that any national leader has given in modern times.
Although he has a factual awareness that an execution date has been scheduled for the crime for which he was tried, he does not believe that he will be executed because of his illogical, fixed, and firmly held delusional belief system," she wrote.
Winston Smith On the Victoria Square anti-capitalism protest Look at these delusional hippies.
It considers whether a general account can be given of delusional mental states.
Speaking in Sidon, Siniora said Aoun was delusional to believe he could end Hariri's political career because it would imply the marginalization of millions of Lebanese.