adj. 25B6; adjective
the mellow tone of his voice : DULCET, sweet-sounding, tuneful, melodious, mellifluous; soft, smooth, warm, full, rich.
a mellow wine : FULL-BODIED, mature, well matured, full-flavoured, rich, smooth.
a mellow mood : GENIAL, affable, amiable, good-humoured, good-natured, amicable, pleasant, relaxed, easy-going; jovial, jolly, cheerful, happy, merry.