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adj. mel·low·er, mel·low·est
a. Soft, sweet, juicy, and full-flavored because of ripeness: a mellow fruit.
b. Suggesting softness or sweetness: "The mellow air brought in the feel of imminent autumn" (Thomas Hardy).
a. Flavorful and mild or smooth, as from being properly matured: a mellow wine.
b. Soft and pleasant; not harsh: a mellow voice; mellow light.
3. Gentle and understanding, especially from being mature or experienced: "She had seen him as a survival of a leisurely and tolerant age, a mellow man" (Elisabeth Ogilvie).
4. Relaxed and unhurried; easygoing: a mellow friend; a mellow conversation.
5. Slang Slightly and pleasantly intoxicated.
6. Moist, rich, soft, and loamy. Used of soil.
tr. & intr.v. mel·lowed, mel·low·ing, mel·lows
To make or become mellow.
Phrasal Verb:
mellow out Slang
To become genial and pleasant; relax: "The cowboy mellowed out when they read him a sweet letter from his wife" (Bobbie Ann Mason).

[Middle English melwe, perhaps from melowe, oblique case of mele, ground grain, meal; see meal1.]

mel′low·ly adv.
mel′low·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.mellowly - (obsolete) in a mellow mannermellowly - (obsolete) in a mellow manner  
archaicism, archaism - the use of an archaic expression
References in classic literature ?
A bell was ringing from the tower of a little white church on the far side; mellowly and dreamily sweet, the chime floated across the water blent with the moan of the sea.
When the mellowly wry Richard Beatty asked me to help him spin platters--well, touch buttons--as a guest-host on his streaming "Geezer Radio" show, I accepted the invitation, after making it clear that I was a relative whipster and in no sense a codger, dotard, or anywhere near geezerdom.
A class a VILLAIN OF T - LORNE MA CHANNEL F With his lud coloured b lapelled ca Thornton arguably malevole possible himself screen Barde unpr Chig Brot For VILLAIN OF THE YEAR - LORNE MALVO (FARGO, CHANNEL FOUR) With his ludicrous chestnutcoloured bowlcut and furrylapelled car coat, Billy Bob Thornton's Lorne Malvo was arguably the most mellowly malevolent hitman - and possible emissary of Satan himself - to grace our screens since Javier Bardem's unpronounceable Anton Chigurh in the Coen Brother's No Country For Old Men.