deranged -
Behaving in an uncontrolled or dangerous way because of mental illness
Charles Manson led a group of followers who became mentally deranged as a result of taking too many psychedelic drugs
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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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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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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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delusional -
Seeing or believing things that are not real
Betty was confident that she would be a millionaire by the time she would be 25, but her friends thought she was delusional.
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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.
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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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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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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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disruptive -
Causing problems or preventing something from continuing smoothly.
During class recess, Joey was always disruptive, and the teacher didn't know quite how to handle it.
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.
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crackpot -
A slightly strange or foolish person
Wearing mismatched clothing and yelling to nobody in particular, the crackpot was amusing and ignored by the people who passed him by.
