1 soft, juicy, luscious, delicious, rich, sweet, flavourful, full-flavoured, ready, ripe, mature, ripened, aged:
She set before us a dish of mellow peaches. Amontillado sherry is noted for its mellow taste
2 musical, melodious, full, pure, rich, sweet, dulcet, mellifluous, euphonious, vibrant:
Her voice was low, mellow, and suggestive.
3 soft, softened, subtle, muted, pastel:
The mellow shades of this painting would fit well into the décor.
4 easygoing, genial, gentle, good-natured, easy, cordial, friendly, warm, amiable, agreeable, pleasant, cheerful, happy, jovial, felicitous:
Patrick seems to have become more mellow with age.
5 mature, ripen, age, season, sweeten, develop, improve (with age), soften:
Frank has mellowed since taking up golf.