Mmm, I'm not so sure that's a good idea.

嗯，我不知道这想法行不行。

《牛津词典》

Honey, I don't really think that's a good idea.

亲爱的，我不认为那是个好主意。

《柯林斯英汉双解大词典》

I don't think that's a good idea. That's just throwing out the baby with the bathwater.

我觉得这不是个好主意。那只是把孩子和洗澡水一起倒掉。

youdao

"She's expected to stay home, not to go away to college or do anything that would betray the family's idea of what it is to be a good daughter."

VOA: standard.2010.07.22

I don't think that's a good idea.

我觉得那不是个好主意。

How about 实战 - SpeakingMax英语口语达人

Obviously, the amounts that are in cigarettes are not enough that people are dropping dead of cyanide poisoning, but still it's not a good idea you definitely want to minimize your exposure.

显然，香烟中的氰化物含量不足,以使人中毒而死，但这毕竟不是一个好主意,你绝对会想要将接触氰化物的机会减到最少。

麻省理工公开课 - 化学原理课程节选

Can you give us any idea whether the President thinks that's a good idea?

WHITEHOUSE: Press Briefing

That's a good idea that would give the Garden State the lowest tax rate in the Northeast after New Hampshire.

WSJ: New Jersey's Flat Tax Debate

That's a good idea if you can swing it, says consultant Engoron.

FORBES: Magazine Article