mellow
adj.adj. relaxed, calm, and pleasant. You use this to describe a person who is easygoing or a sound that is soft and smooth.
adj. characterised by a relaxed, easygoing temperament or a soft, resonant quality of sound. Often describes the pleasant maturity of wine, cheese, or a person's character over time.
He became much more mellow as he got older.
After a long day at the office, she liked to listen to some mellow jazz to help her unwind.
The golden hour light gave the entire valley a mellow glow, softening the sharp edges of the granite cliffs and signaling the end of the trek.
The adjective is derived from Late Middle English melowe, melwe (“ripe, mellow; juicy; sweet”) [and other forms]; further etymology uncertain, possibly: from an attributive use of melow, melowe, melewe, mele (“meal from ground grain or legumes; flour; kernel of barley or lentils”) [and other forms], from Old English melo, melu (“meal (edible part of a grain or pulse); flour”), from Proto-Germanic melwą (“ground corn; meal; flour”), from Proto-Indo-European *melh₂- (“to crush; to grind”); or a variant of Middle English merow, merowe, meruw (“soft, tender; of a person: frail; of love: unstable, variable”) [and other forms], from Old English meru, mearu (“soft, tender; delicate, frail; callow”) [and other forms], from Proto-Germanic marwaz (“soft, mellow; brittle, delicate”), from Proto-Indo-European *mer(w)- (“to rub; to pack”). The noun and verb are both derived from the adjective. The etymology of noun sense 3 (“close friend; lover”) is unknown, but may also be derived from the adjective. Cognates * Dutch murw (“tender”) * German mürbe (“soft, tender”) * German Low German möör (“tender”) * Old Norse mör (“tender; aching”) (Icelandic meyr (“tender”)) * Saterland Frisian muur (“tender”) * West Frisian murf (“tender”)
Often follows linking verbs like 'become', 'stay', or 'feel'.