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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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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.

adjective

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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

adjective

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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.

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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berserk - To behave in a wild and uncontrolled way as a result of something unexpected happening.

When Anne found out that she had lost all her money as a result of stock fraud, she went berserk, running around the house, screaming and breaking dishes.

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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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.

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.

adjective

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daffy - Silly, different, strange, and funny

Fred had a twirled mustache and wore an oddly colored suit, but the town's residents simply viewed him as daffy instead of someone to be afraid of.

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.

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.