It let out a long sequence of meaningless noises.

Leto had said it but the words were a meaningless noise compared to the thing seen and felt in this great hall.

"The best argument they can make is meaningless noise," he added as his troops cheered.

Without something mental to back it up, the utterance is just sounds in the air, a meaningless noise.

As it was, he could broadcast a loud, meaningless noise.

For a time the words were a meaningless noise.

That word 'continue' is a classic example of a meaningless noise, isn't it?

They made meaningless noises at each other as a dim twilight stole over the land.

Her voice reached him through the thunder of meaningless noise.

Then, she argues, the rot set in, and popular music turned into horrible, meaningless noise.