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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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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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.
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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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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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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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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wacky -
Something that is strange and different to the point of amusement.
George’s grandmother was well known and loved for her wacky taste in shoes.
noun
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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.
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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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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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.
