| Answer | Crossword Clue |
|---|---|
| ECHO | Footsteps-in-an-empty-hallway sound |
| ECHO | Sound heard in an empty hallway |
| ECHO | Sound in an empty auditorium |
| ECHO | Sound in an empty hall |
| ECHO | Sound in an empty room |
| ECHO | Sound in an empty concert hall |
| hollow | (of a sound) Echoing, as though made in or on an empty container |
| hollower | (of a sound) Echoing, as though made in or on an empty container |
| hollowest | (of a sound) Echoing, as though made in or on an empty container |
