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delusional - Seeing or believing things that are not real

Betty was confident that she would be a millionaire by the time she would be 25, but her friends thought she was delusional.

noun

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maniac - Someone who is mentally ill tending towards violent and dangerous behavior.

The film’s villain was portrayed as a ruthless maniac with no regard for human life.

noun

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compulsion - A strong, irresistible urge to do something, often against one's better judgement.

His gambling problem stemmed from a deep psychological compulsion.

adjective

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catatonic - Appearing to be in a daze or stupor; unresponsive, not moving or reacting.

His experiment with psychodelics left him in a catatonic state where he showed almost no emotion, and it that took years for him to recover.

adjective

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nuts - Crazy, insane, or stupid, often in a humorous way

Bill's friends thought he was nuts for swimming in the middle of the winter.

noun

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weirdo - A person whose dress or behavior seems strange

The weirdo kept peeking at everyone from behind the bushes.

adjective

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deranged - Behaving in an uncontrolled or dangerous way because of mental illness

Charles Manson led a group of followers who became mentally deranged as a result of taking too many psychedelic drugs

adjective

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bonkers - Mentally unbalanced, mad and crazy, usually meant humorously

There were many long stretches of time that Joan was cooped up in the house with her kids, and it was making her go bonkers.

noun

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lunacy - Stupid or crazy ideas or behavior that is likely to have bad results

When Edwin Hubble suggested in 1922 that most of the little dots in the sky are entire galaxies, most scientists thought that the idea was sheer lunacy.

noun

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crank - Someone who others think has unusual ideas or behaves strangely

Bill was seen as crank by his friends, because of the way he always spoke of the dangers of eating meat and being vaccinated.

adjective

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batty - Mad and slightly crazy, usually in a humorous way

The computer system wouldn't let Greg log on or change his password, and it was driving him batty.

adjective

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berserk - To behave in a wild and uncontrolled way as a result of something unexpected happening.

When Anne found out that she had lost all her money as a result of stock fraud, she went berserk, running around the house, screaming and breaking dishes.