A word for "someone not good at sports"

Hi,
'Unathletic' is commonly used.

Clive

Hello, that's quick.

Is there an informal way to say it?
The Chinese phrase is very informal, so I'd like a word in English matching the register. =)

A very informal word would be klutz or spaz.

It depends on what aspect of the concept you want to focus on. weak? unskillful? uninterested?

a frail person, a delicate person, a weakling, someone who is listless, someone who lacks energy, an unfit person, someone who is not in shape, a clumsy person, an uncoordinated person, an inept person, an awkward person, a bungler, a butterfingers, someone who is all thumbs, someone with tw

Thanks to you all. [8]

To elaborate on Grammar Geek's reply:

A klutz is someone who is clumsy and constantly drops things.  

I don't know if I'd use the word "spaz" to describe someone who's bad at sports specifically.  It means someone a little crazy, overexcitable, or out of control.

I wouldn't use the word "spaz" at all, ever. I'm pretty sure it comes from "spastic," describing someone with a muscular disease.

For someone who doesn't like exercise or sports at all, except maybe to watch on tv -- "couch potato."

Thanks, khoff.

'spaz' is extremely offensive in the UK - DON'T use it.

Copy that!