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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.

noun

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weirdo - A person whose dress or behavior seems strange

The weirdo kept peeking at everyone from behind the bushes.

noun

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psycho - A person with severe mental health issues, often describing someone who behaves in an erratic or dangerous manner.

She accused him of being a psycho and told him to leave after he repeatedly showed up uninvited and acted innappropriately.

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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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.

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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.

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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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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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megalomaniac - Someone who has an unnaturally strong wish for power and control.

The dictator showed signs of being a megalomaniac even as a child, the way he bossed everyone around in the schoolyard.

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

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.