You could say,for example, that a bad idea is not worth a hill of beans.

VOA: special.2010.01.31

My first advice is if you want to make money, which I don't particularly advise, but if you do it's not a bad idea to go into finance.

我的第一个建议是,如果你想赚些钱,虽然我并不鼓励,但如果你要赚钱,那从事金融并不是个坏主意

耶鲁公开课 - 金融市场课程节选

There's really a really bad idea that gets funded, ok.

那个说法的确不太好。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

Donohue said it was a bad idea because the costs would simply be passed on to consumers.

VOA: standard.2010.01.12

It's a bad idea. Fortunately,the congress would have to approve this,".

VOA: standard.2010.01.12

"It might not be a bad idea to let people know verbally, out loud,for all the world to see, , the kind of support,at least talk, that we appreciate what they are doing and that we are inspired by their courage.

VOA: standard.2009.10.28

Now,after the marriage ceremony Slue-foot Sue got a really bad idea.

VOA: special.2011.06.11

Mr.Fillon said he prefers the idea of a public-private partnership to buy up the bad assets, and that this will prompt European countries to consider similar measures.

VOA: standard.2009.03.24