mellow (adj.) Look up mellow at Dictionary.com
mid-15c., melwe "soft, sweet, juicy" (of ripe fruit), perhaps related to melowe, variant of mele "ground grain" (see meal (2)), influenced by Middle English merow "soft, tender," from Old English mearu. Meaning "slightly drunk" is from 1680s. Mellow yellow "banana peel smoked in an effort to get high" is from 1967. Related: Mellowly; mellowness.
mellow (v.) Look up mellow at Dictionary.com
1570s, from mellow (adj.). Related: Mellowed; mellowing.