delusional
He believes he is a famous inventor, but his ideas are completely delusional.
Adjective: 1. Suffering from or characterized by delusions: Relating to or experiencing false beliefs that are held despite clear evidence to the contrary, often due to a mental disorder. 2. Based on or holding false beliefs: More broadly, describing a state of mind or ideas that are not grounded in reality.
The adjective "delusional" is used to describe a person, their state, or their beliefs. It is often used in clinical/psychiatric contexts but is also common in general language to strongly criticize an idea as being completely out of touch with reality. - It typically precedes a noun (e.g., a delusional patient) or follows a linking verb (e.g., He is delusional). - In informal, critical usage, it can stand alone as a predicate adjective (e.g., That claim is delusional).
Clinical Context:
- The psychiatrist diagnosed the patient as delusional.
- She was experiencing delusional thoughts about being persecuted.
General/Critical Context:
- His belief that he could become a billionaire overnight was completely delusional.
- It's delusional to think you can pass the exam without studying.
- "delusional disorder": A specific psychiatric diagnosis characterized by one or more non-bizarre delusions without other prominent psychotic symptoms.
- He was treated for a delusional disorder involving a belief he had a special relationship with a celebrity.
- Delusion (n): A false belief held firmly despite incontrovertible evidence to the contrary. This is the noun from which "delusional" is derived.
- He was under the delusion that he was invincible.
- Delude (v): To mislead the mind or judgment of; to deceive.
- He tried to delude them into thinking he was an expert.
- Psychotic (in a clinical sense, though broader)
- Out of touch with reality
- Fantastical
- Irrational
- Rational
- Lucid
- Sane
- Realistic
- "Living in a delusional world": Used to describe someone who consistently ignores reality in favor of their false beliefs.
- By refusing to acknowledge the company's losses, the CEO is living in a delusional world.
He believes he is a famous inventor, but his ideas are completely delusional.
- suffering from or characterized by delusions