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.
adjective
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zany -
Amusingly unconventional and different
Einstein was unique among geniuses in that he also had a silly and zany side of his personality.
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.
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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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.
adjective
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catatonic -
Appearing to be in a daze or stupor; unresponsive, not moving or reacting.
His experiment with psychodelics left him in a catatonic state where he showed almost no emotion, and it that took years for him to recover.
noun
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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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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.
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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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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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.
