1.unhurried and relaxed;
an easygoing pace
2.having a full and pleasing flavor through proper aging;
a mellow port
3.having attained to kindliness or gentleness through age and experience;
mellow wisdom
4.having or suggesting softness and richness in quality;
a mellow sound
5.slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)
6.(obsolete) in a mellow manner
1.soften, make mellow;
Age and experience mellowed him over the years
2.become more relaxed, easygoing, or genial;
With age, he mellowed
3.make or grow (more) mellow;
These apples need to mellow a bit more