'Time'.
darkness or emptiness?
Death it's self. Or the Grim reaper as some people call him.
Because empty space cannot propagate sound.
A vacuum is a region empty of matter through which sound cannot travel. In a vacuum, there are no particles to transmit sound waves, so no sound can be heard.
The answer to this riddle is darkness. It cannot be sensed through the traditional human senses, yet it is all around us. It is often associated with the unknown and can be found in various places, including behind stars and under hills. It symbolizes the beginning and end of life.
No, when you empty the recycle bin you should here a sound.
The answer to this riddle is "silence." While silence cannot be seen, it can definitely be heard or felt through the absence of sound.
Time. Contrary to common belief, it's not 'darkness'. I don't die at night when the lights are off, and I can think of something funny in complete darkness and laugh. You can also see darkness. Time is omnipresent, it's everywhere. Darkness, a LACK of light, can't 'fill' anything, because it's a lack of light. Everything ends with time, and nothing lasts forever. You can't laugh forever, you'd die. Darkness. Seen in all of the editions of "The Hobbit" by J.R.R. Tolkien, this riddle is answered by Bilbo Baggins in a riddle contest with the creature Gollum. "Unfortunately for Gollum Bilbo had heard that sort of thing before; and the answer was all around him any way. "Dark!" he said without even scratching his head or putting on his thinking cap." One might be able to argue that a correct answer to the riddle is Time, but I cannot see how time could fill a hole and kill laughter.
The wind
Radiation cannot be seen or smelled, as it is invisible and odorless. It also does not make any sound, so it cannot be heard.
Silent, soundless, inaudible.
The source that Jonas had thought that he had heard behind him might have been just his memories of music, giving him what he was wishing he would hear.