This isn't a terrible idea; it just doesn't have much to do with anything else going on here.
So I've been thinking it wouldn't be such a terrible idea to make a phone call or two.
It was part of a terrible idea to open up the book club to the men in our lives.
Yet another example that trying to be good to people is generally a terrible idea.
But why couldn't he see what a terrible idea it was?
I agree with most that this is a terrible idea.
It didn't seem like such a terrible idea to him.
But his older brother thought that was a terrible idea.
Oh, and yeah the bill looks like a terrible idea.
Using the military for this purpose would be a terrible idea.