Definition of mellows:
(adj) :
(also figuratively, of food or drink, or its flavour) Matured and smooth, and not acidic, harsh, or sharp.
(adj) :
(also figuratively, of fruit) Soft or tender by reason of ripeness; having a tender pulp.
(adj) :
(figuratively) (of colour, sound, style, etc.) Not coarse, brash, harsh, or rough; delicate, rich, soft, subdued.
(adj) :
(figuratively) Well-matured from age or experience; not impetuous or impulsive; calm, dignified, gentle.
(adj) :
(figuratively) Cheerful, genial, jovial, merry; also, easygoing, laid-back, relaxed.
(n) :
The property of being mellow; mellowness.