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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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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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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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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.

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.

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.

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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

noun

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weirdo - A person whose dress or behavior seems strange

The weirdo kept peeking at everyone from behind the bushes.

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.

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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.

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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.