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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hysterical -
Having uncontrolled extreme emotion
When Amy found out that her house had been destroyed by the tornado, she broke down into hysterical crying, and could not be comforted for hours.
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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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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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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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.
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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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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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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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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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.
