Mellifluous
Etymology
From Latin mel, "honey," and fluere, "to flow" — literally "flowing with honey." It first described speech or writing so sweet it seemed honeyed, and by extension any sound with that smooth, liquid richness. The image of honey pouring is doing all the work: sound as something you could almost taste.
adjective · /meh-LIF-loo-us/
Sweet-sounding and smooth, pleasing to the ear.
What it names
The rich, flowing sweetness of a voice or music that seems to pour effortlessly, like honey.
Example
The narrator’s mellifluous voice made even the driest passages of the audiobook a pleasure.
Related idea
Dulcet also means sweet-sounding but leans soothing and gentle; mellifluous emphasizes a smooth, flowing richness.