The room and the corridor outside were full of quiet, unidentifiable sounds, and she did not know enough to be able to ignore them.

Lindy kept to the shadows, inching her way closer to the horses, when an unidentifiable sound alerted her.

The letterhead lists a phone number for the association, but calls to that number reached an answering machine that played only an unidentifiable sound.

There was an unidentifiable sound from Boldt.

They ascended the gangways beside it, like whispering traps of dead air and unidentifiable sounds.

Her ears were buffeted by unidentifiable sound.

There were other and unidentifiable sounds.

That night Wilhelm is awoken by an unidentifiable sound; he does not, however, find anyone whom he can ask what it was.

As he approached, he could hear small, unidentifiable sounds coming from her lips.

The report details unidentifiable sounds originating from beneath the seafloor within the Chicxulub impact crater.