I've never heard such a ridiculous idea in my entire life.

All the same, if she hadn't known it to be a ridiculous idea.

It was a ridiculous idea, something his father could never do.

"Whatever gave you the ridiculous idea that this is the end of the world?"

The other ridiculous idea is that a visiting team cannot bring its school band.

She has the ridiculous idea that her father will show up at any moment.

Buying her a present was a ridiculous idea, out of proportion to the current situation.

But the young men scoffed at such a ridiculous idea.

Imagine, she said, how many people called his idea not merely ridiculous, but impossible.

The home schooling was a ridiculous idea when the age range is so vast.