blabbermouth -
An overly talkative person who speaks without thinking.
Don't tell Jerry things you don't want others to know about, because you can’t trust a blabbermouth with secrets.
adjective
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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
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.
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.
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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zany -
Amusingly unconventional and different
Einstein was unique among geniuses in that he also had a silly and zany side of his personality.
noun
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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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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.
noun
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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.
adjective
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unhinged -
Mentally unbalanced and unstable
Trevor crossed the street when he saw the unhinged person yelling at him.
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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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.
