“Mellifluous” is an adjective that comes from the Latin words “mellitus” meaning “honey” and “fluus” meaning “flowing”. A mellifluous voice is one that is sweet, smooth, and flowing.

Example: “Every time my young children had a hard time falling asleep, I would play a recording of Cecila Bartolli singing Italian lullabies, and her mellifluous voice would lull them to sleep quickly.”