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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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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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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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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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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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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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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.

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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.

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cantankerous - Bad-tempered, argumentative, and uncooperative

The constant arguing of the cantankerous couple living above Ann always kept her up at night.

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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.

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weirdo - A person whose dress or behavior seems strange

The weirdo kept peeking at everyone from behind the bushes.

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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