Einstein was unique among geniuses in that he also had a silly and zany side of his personality.
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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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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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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.
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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.
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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.
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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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unhinged -
Mentally unbalanced and unstable
Trevor crossed the street when he saw the unhinged person yelling at him.
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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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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.
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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.
