Questions about example sentences with, and the definition and usage of "Maniac"

A: It means that you hope someone goes to prison/is sent to a mental hospital and stays there.

A: It means you study very hard.

A: thank you!!

A: maniac is a noun meaning someone who exhibits wild behavior

That guy is a maniac.

crazy is typically an adjective describing the mental condition of someone
or
an adverb meaning enthusiastic

She went crazy and beat them up.
or
He is crazy about her.

crazy is sometimes used as a noun meaning deranged person, but in my experience, it is not very common since this usage is considered derogatory

We need to keep that crazy locked up.

A: I meand the same thing. It means that they're crazy

A: OK, they both have similar meanings related to obsessive, mad, unpredictable, irrational, violent, etc., behaviour -- from somewhat mild to more extreme.

"She is crazy about boy bands."
"He is a maniac for anything to do with motorbikes."

"He went crazy cleaning the house."
"She was working like a maniac."

"All of a sudden she just went crazy."
"He acted like a maniac for no apparent reason."

"He was driving like a maniac."
"She was running like crazy."

I would normally hear maniac used as a noun and crazy as an adjective but they can both appear as different parts of speech.

I would say "maniacal" for the adjective.

"All you could hear was her maniacal laughter."

But some people do use "maniac" (or "manic"). Also, I wouldn't use "crazy" as a noun, but others would.

"There was a bunch of crazies down the street."

So, that's how the two words relate to behaviour (of people and perhaps animals), generally.

Crazy has some additional meanings where you wouldn't use any form of maniac.

"When they found the boat the mast was at a crazy angle."

"The glaze on the pot had become crazy from years of use."

"He made a new path with crazy paving."

That's all the common uses I can think of. It was very interesting looking it up in detail. Let me know if anything isn't clear.

A: A maniac is just a crazy person basically.
An addict is someone who can't stop doing something
ie) videogame addict, sex addict

A: 正確に言って「頭の狂った野郎」という言い回しですが、適しているのではと思います。

A: Simple way of saying:

There are still some maniacs trying to start a fire for their own sake (purposes).

A more advance way of saying:

There are still some maniacs attempting arson for their own gain.

(Arson - To set someone's property, building or house, on fire)

A: Check the question to view the answer

A: I would say "He was crazy for the camera"