動(dòng)詞 mellow:

1. soften, make mellow
2. become more relaxed, easygoing, or genial
   同義詞：melt, mellow out
3. make or grow (more) mellow

形容詞 mellow:

1. unhurried and relaxed
   同義詞：laid-back
2. having a full and pleasing flavor through proper aging
   同義詞：mellowed
3. having attained to kindliness or gentleness through age and experience
   同義詞：mellowed
4. having attained to kindliness or gentleness through age and experience
5. slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)
   同義詞：high

副詞 mellow:

1. (obsolete) in a mellow manner
   同義詞：mellowly

1. The orchestra had a distinctively warm and mellow sound.
   這個(gè)管弦樂隊(duì)演奏的特色是聲音優(yōu)美柔和。
2. Age has mellowed his attitude to some things.
   他隨著年齡的增加，對(duì)某些事情的看法已日趨成熟。
3. He has a mellow attitude to life.
   他對(duì)生活有種成熟的看法。
4. A few more years will mellow the wine.
   再過幾年這酒就會(huì)香醇。
5. As they mature, many young radicals mellow into a more tolerant attitude towards life and society.
   隨著逐漸成熟，許多年輕的激進(jìn)分子對(duì) 生活和社會(huì)漸持較為寬容的態(tài)度。

mel.low

adj.（形容詞）
mel.low.er,mel.low.est

Soft, sweet, juicy, and full-flavored because of ripeness:
成熟的，甘美多汁的：因成熟而柔軟的、甜蜜的、多汁的、味濃的：
例句：
a mellow fruit.
軟熟多汁的果實(shí)

Suggesting softness or sweetness:
柔和的，甜蜜的：使人覺得柔軟與甜蜜的：
例句：
.The mellow air brought in the feel of imminent autumn.(Thomas Hardy)
.甜美芳香的空氣給人以秋天將至的感覺.(托馬斯·哈迪)

Rich and soft in quality:
芳醇的：質(zhì)地醇厚甜軟的：
例句：
a mellow sound; a mellow wine.
醇厚甜軟的聲音；芳醇的葡萄酒

Having the gentleness, wisdom, or tolerance often characteristic of maturity.
老練的，穩(wěn)健的：具有常被作為成熟之特征的溫和性情、智慧和忍耐力
Relaxed and unhurried; easygoing:
放松的，不急躁的；易相處的：
例句：
a mellow friend; a mellow conversation.
易相處的朋友；悠閑自在的談話

Slang
【俚語】
Slightly and pleasantly intoxicated.
微醉的：因微醉而感到輕松和愉快的
Pleasantly high from a drug, especially from smoking marijuana.
飄飄然的：因食用藥物，尤指因吸食大麻而感覺愉快而輕飄飄的
Moist, rich, soft, and loamy. Used of soil.
（指土壤）濕潤(rùn)的，富饒的，柔軟的，肥沃的
v.tr.intr.（及物動(dòng)詞和不及物動(dòng)詞）
mel.lowed,mel.low.ing,mel.lows
To make or become mellow.
使甘美多汁，變熟

<常用詞組>mellow out 【俚語】
To become genial and pleasant; relax:
變得和藹愉快；放松：
例句：
.The cowboy mellowed out when they read him a sweet letter from his wife.(Bobbie Ann Mason)
.當(dāng)他們給他念了他妻子的來信后，這個(gè)牛仔變得樂陶陶的.(鮑比·安·梅森)

來源：
Middle English melwe
中古英語 melwe
perhaps from melowe
可能源自 melowe
variant of mele [ground grain, meal] * see meal
mele的變體 [谷物，飯] *參見 meal

【引伸】
mel.lowly
adv.（副詞）
mel.lowness
n.（名詞）