(especially of a sound, flavour, or colour) pleasantly smooth or soft; free from harshness

she was hypnotized by the mellow tone of his voice

slow cooking gives the dish a sweet, mellow flavour

(of a person's character) tempered by maturity or experience

a more mellow personality

(of earth) rich and loamy

to most farmers, soil has good tilth when it is mellow and granular and crumbles easily in the hand