"I think it's a ridiculous waste of time."

I'm not sure that more expensive tents would make a huge difference, but something needs to be done to prevent such a ridiculous waste.

IMO they are a ridiculous waste of resources.

"That's a ridiculous waste of money," Gladys said.

Lightning's kin-worship annoyed me; it was a ridiculous waste of time.

"It is a ridiculous waste of money," an agent said.

It's a supremely ridiculous waste of everybody's time.

Watching a blank screen, waiting for it to crackle to life, was a ridiculous waste of time.

It's all perfectly correct and legal, but what a ridiculous waste of time and effort.

"We can't wait another four years to put another album out; that's just a ridiculous waste of time."