Thundering describes a sound that is deep and resounding—or resembling thunder. The thundering sound of feet hurrying down the hall is one sign that school's over for the day.
The sound of a thunderstorm can be described as thundering of course, but so can other loud, booming noises. You might love the thundering sound of a rock concert but hate the thundering voice of an angry parent scolding a child. This adjective comes from the verb thunder, which we can trace back to a root that means "resound."