WordWeb Online

1. Kindheartedness through maturity or old age
    
2. A taste (especially of fruit) that is ripe and of full flavour
    
3. The property of a sensation that is rich and pleasing
   "the cheap wine had no body, no mellowness"
   - fullness, richness, fulness
    
4. A soft shade of a colour
   "a mellowness of light and shade not attainable in marble"
    
5. Geniality, as through the effects of alcohol or marijuana

Derived forms: mellownesses

See also: mellow

Type of: affability, affableness, amiability, amiableness, bonhomie, geniality, gustatory perception, gustatory sensation, kindheartedness, kind-heartedness, property, shade, taste, taste perception, taste sensation, tincture, tint, tone