hush
faint or low noise
A slight noise that you cannot hear well may be described as faint or low:
muffled
A sound that is quiet and not clear may be described as muffled:
muted noise
A muted noise, meanwhile, is more quiet than you would expect, sometimes suggesting a lack of enthusiasm:
din or racket (informal) noise
A loud noise that is unpleasant and continues for a while may be called a din or a (informal) racket:
Racket : informal an unpleasant loud continuous noise:
commotion
A commotion is a continuous, loud noise that suggests confusion or arguments:
hubbub
A hubbub is similar and suggests the noise of people talking excitedly:
A loud noise, especially caused by a lot of people all talking at the same time:
clatter
A continuous loud noise made by hard objects hitting each other is sometimes called a clatter:
can’t hear yourself think:
blaring (out) or being at full blast
A radio/television/hi-fi, etc. that is extremely loud is sometimes described as blaring (out) or being at full blast:
could have heard a pin drop
To describe a place or a situation that was completely quiet, with no one speaking, you might say you could have heard a pin drop:
Something that you say in order to describe a situation where there was complete silence, especially because people were very interested or very surprised by what was happening: