Etymology
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mellow (adj.)

mid-15c., melwe, of fruit, "soft, sweet, juicy" (especially from ripeness), perhaps a variant of merow "soft, tender," from Old English mearu "soft, tender." General sense of "of ripe age or quality, perfected by maturing," from 1590s. Of color by 1560s; of sound, "soft, rich, or delicate to the perception," by 1660s. Meaning "slightly drunk, rendered good-humored or genial by intoxication" is from 1680s. Modern slang sense of "feeling good after smoking marijuana" is by 1946. Mellow yellow "banana peel smoked in an effort to get high" is from 1967. Related: Mellowly; mellowness.

mellow (v.)

1570s, "to ripen, bring to maturity" (transitive), from mellow (adj.). Intransitive sense of "become soft, be ripened" is from 1590s. Transferred sense of "give richness, flavor, or delicacy to" is from 1590s. Related: Mellowed; mellowing.

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Definitions of mellow
1
mellow (adj.)
unhurried and relaxed;
a mellow conversation
Synonyms: laid-back
mellow (adj.)
having a full and pleasing flavor through proper aging;
a mellow port
mellowed fruit
Synonyms: mellowed
mellow (adj.)
softened through age or experience;
the peace of mellow age
mellow wisdom
Synonyms: mellowed
mellow (adj.)
slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana);
Synonyms: high
2
mellow (v.)
soften, make mellow;
Age and experience mellowed him over the years
mellow (v.)
become more relaxed, easygoing, or genial;
With age, he mellowed
Synonyms: melt / mellow out
mellow (v.)
make or grow (more) mellow;
The sun mellowed the fruit
These apples need to mellow a bit more
3
mellow (adv.)
in a mellow manner;
Synonyms: mellowly
From wordnet.princeton.edu