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lunatic - A person who is crazy

Martha was a defensive driver, to be safer with regards to a possible lunatic behind the wheel of another car.

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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.

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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.

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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.

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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.

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zany - Amusingly unconventional and different

Einstein was unique among geniuses in that he also had a silly and zany side of his personality.

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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.

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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.

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delirious - In a disturbed state of mind, often due to illness or fever, leading to confusion and hallucinations.

After three sleepless nights, he was delirious and barely able to speak clearly.

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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.

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crackpot - A slightly strange or foolish person

Wearing mismatched clothing and yelling to nobody in particular, the crackpot was amusing and ignored by the people who passed him by.

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unhinged - Mentally unbalanced and unstable

Trevor crossed the street when he saw the unhinged person yelling at him.