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adjective

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kooky - Strange and different, in a funny way

Salvador Dali's kooky appearance was only exceeded by his even more bizarre paintings.

noun

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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.

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.

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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unhinged - Mentally unbalanced and unstable

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

adjective

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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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loony - Crazy or silly

The patients in the mental hospital could be described as loony, but the doctors tried to treat them as normal human beings with normal problems in order to try to help them get better.

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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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.

adjective

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cantankerous - Bad-tempered, argumentative, and uncooperative

The constant arguing of the cantankerous couple living above Ann always kept her up at night.

adjective

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daffy - Silly, different, strange, and funny

Fred had a twirled mustache and wore an oddly colored suit, but the town's residents simply viewed him as daffy instead of someone to be afraid of.