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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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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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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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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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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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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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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.

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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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weirdo - A person whose dress or behavior seems strange

The weirdo kept peeking at everyone from behind the bushes.

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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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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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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.