Trevor crossed the street when he saw the unhinged person yelling at him.
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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.
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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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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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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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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.
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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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compulsion -
A strong, irresistible urge to do something, often against one's better judgement.
His gambling problem stemmed from a deep psychological compulsion.
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loudmouth -
Someone who speaks loudly and without thinking, often causing trouble or embarrassment.
Even though he was a real loudmouth, always bragging about his achievements and rarely listening to others, he was still amazingly successful.
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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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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.
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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.
