maybe that is not a good idea(同义句)that ____ ____ be a good idea

maybe that is not a good idea(同义句)that ____ ____ be a good idea
maybe that is not a good idea(同义句)
that ____ ____ be a good idea

maybe that is not a good idea(同义句)that ____ ____ be a good idea
最准确的答案是：
Maybe that is not a good idea.
= That (may not) be a good idea.

It's likely a bad idea

maybe that is a bad idea