noun. The state or quality of being mellow, in any sense of that word.

noun. Quality or state of being mellow.

noun. The property of being mellow.

noun. a taste (especially of fruit) that is ripe and of full flavor

noun. geniality, as through the effects of alcohol or marijuana

noun. kindheartedness through maturity or old age

noun. the property of a sensation that is rich and pleasing

noun. a soft shade of a color

"But as the wood-wind grows in mellowness and richness, the flute gradually dies away into a secondary theme and the wood-wind alone evolves the melody of a new song."

affability  affableness  amiability  amiableness  bonhomie  

agreeableness  ampleness  costliness  eyeful  fleshiness  

affability  agreeability  agreeableness  amenity  amiability  

mellow