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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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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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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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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kooky -
Strange and different, in a funny way
Salvador Dali's kooky appearance was only exceeded by his even more bizarre paintings.
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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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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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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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bonkers -
Mentally unbalanced, mad and crazy, usually meant humorously
There were many long stretches of time that Joan was cooped up in the house with her kids, and it was making her go bonkers.
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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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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.
