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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.

adjective

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unhinged - Mentally unbalanced and unstable

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

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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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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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.

adjective

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mercurial - Changing emotions suddenly and often

Fred loved almost everything about his wife except her mercurial behavior, where her moods changed suddenly between sadness and happiness, or love and anger

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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.

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.

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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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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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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mischievous - Playfully causing trouble or annoyance, often in a fun or harmless way.

Her mischievous cat knocked over the plant just to get her attention.