The term 'dreary sound' can be represented by two crossword solutions, 'DRONE' and 'DIRGE'. A DRONE is a continuous, low-pitched sound that is often described as monotonous and dull. It is typically created by an electronic device or an insect such as a bee. A DIRGE is a slow, mournful song or piece of music that is usually played at funerals. It is often used to express sorrow and grief. Both of these words accurately describe a dreary sound.