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noun

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blabbermouth - An overly talkative person who speaks without thinking.

Don't tell Jerry things you don't want others to know about, because you can’t trust a blabbermouth with secrets.

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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.

adjective

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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.

noun

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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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unhinged - Mentally unbalanced and unstable

Trevor crossed the street when he saw the unhinged person yelling at him.

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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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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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catatonic - Appearing to be in a daze or stupor; unresponsive, not moving or reacting.

His experiment with psychodelics left him in a catatonic state where he showed almost no emotion, and it that took years for him to recover.

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mischievous - Playfully causing trouble or annoyance, often in a fun or harmless way.

Her mischievous cat knocked over the plant just to get her attention.

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.

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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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zany - Amusingly unconventional and different

Einstein was unique among geniuses in that he also had a silly and zany side of his personality.