Slowly it resolved itself into a guttural, almost unintelligible voice.

Another voice, indistinct and unintelligible, called something in reply from the background.

A burst of static came back at him, carrying with it an unintelligible voice.

A rough, unintelligible voice could be heard grunting orders.

His comm had squawked twice with human voices, faint and unintelligible.

As soon as his mother opened the door, a loud unintelligible voice began to boom in the downstairs hail.

He said in a hoarse and almost unintelligible voice, "Are we headed in the right direction?"

The unintelligible voices, coming from no visible sources, had been mixed with other sounds, hard to identify but suggestive of small objects being moved about.

He kept his ears open; then he again heard voices - distorted and unintelligible - this time coming from higher up.

Then the marching band struck up downstairs, its music drowning out the unintelligible voices.