mellow

American  

[mel-oh] / ˈmɛl oʊ /

adjective

mellower, mellowest

1. soft, sweet, and full-flavored from ripeness, as fruit.

   Antonyms:

   green, raw, immature

2. well-matured, as wines.

3. soft and rich, as sound, tones, color, or light.

   Antonyms:

   harsh

4. made gentle and compassionate by age or maturity; softened.

5. friable or loamy, as soil.

6. mildly and pleasantly intoxicated or high.

7. pleasantly agreeable; free from tension, discord, etc..

   a mellow neighborhood.

8. affably relaxed; easygoing; genial.

   a mellow teacher who is very popular with her students.

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verb (used with or without object)

1. to make or become mellow.

   Synonyms:

   improve, mature, develop

noun

1. Slang. a state, atmosphere, or mood of ease and gentle relaxation.

verb phrase

1. mellow out

   1. to become detached from worry, strife, stress, etc.; relax.

      After final exams let's go down to the beach and mellow out.

   2. to make more relaxed, agreeable, workable, etc.; soften or smooth.

      Chopin really mellows me out when I'm feeling tense.

mellow British  

/ ˈmɛləʊ /

adjective

1. (esp of fruits) full-flavoured; sweet; ripe

2. (esp of wines) well-matured

3. (esp of colours or sounds) soft or rich

4. kind-hearted, esp through maturity or old age

5. genial, as through the effects of alcohol

6. (of soil) soft and loamy

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verb

1. to make or become mellow; soften; mature

2. (foll by out) to become calm and relaxed or (esp of a drug) to have a calming or relaxing effect on (someone)

Usage

What does mellow mean? Mellow means soft, sweet, and full of flavor, usually in reference to ripe fruits. Mellow can also mean well matured, especially in reference to wine. Mellow can also mean soft and rich, usually in reference to sound, color, or musical tone. And mellow can describe a mild and pleasant intoxication or high. You’ll also see mellow used in reference to people. A mellow person is usually easy-going and relaxed. If they’ve mellowed over time, they’ve become more relaxed. In slang, mellow means a mood or atmosphere of relaxation. You might hear something like “Don’t harsh my mellow,” meaning “Don’t spoil my good mood.”Example: Luis became much more mellow after they left their stressful job.

Related Words

See ripe.

Other Word Forms

• mellowly adverb
• mellowness noun
• overmellow adjective
• overmellowly adverb
• overmellowness noun
• unmellow adjective
• unmellowed adjective

Etymology

Origin of mellow

First recorded in 1400–50; late Middle English mel(o)we, alteration (perhaps by dissimilation, in phrase meruw fruit ) of Middle English meruw, Old English meru “soft”

Explanation

When something becomes mellow, it gets softer or more relaxed. People are often said to mellow with age, meaning their aggressiveness, their sarcasm, and their short temper have given way to a more easygoing, genial manner. Wine and other foods mellow just like people, and can be described as "having mellowed" when they reach a full and pleasing flavor, without sharpness. The laid-back quality of jazz pieces like John Coltrane’s “My Favorite Things” is often described as mellow. Sometimes the musicians who play them are mellow too. When people are slightly and pleasantly intoxicated, they often claim to be feeling mellow, having attained a relaxed and agreeable state without even having to grow old.

Example Sentences

The regime would mellow over time with economic engagement, some said.

From The Wall Street Journal • Apr. 3, 2026

The edges of radicchio mellow just enough to stay interesting.

From Salon • Dec. 16, 2025

What remained was the beautifully mellow sound of a vintage Steinway piano he’d had restored after buying it on Craiglist for $800.

From Los Angeles Times • Nov. 22, 2025

And their experience was actually quite mellow compared to other flotillas because of how social media had been reacting to it.

From Slate • Sep. 29, 2025

His voice was mellow and loaded with more meaning than I could fathom.

From "Invisible Man" by Ralph Ellison

Related Words

• delicate
• savory
• soft
• soothing
• sweet