形容詞 mercurial:

1. liable to sudden unpredictable change
   同義詞：erratic, fickle, quicksilver
2. relating to or under the (astrological) influence of the planet Mercury
3. relating to or having characteristics (eloquence, shrewdness, swiftness, thievishness) attributed to the god Mercury
4. relating to or containing or caused by mercury

1. A mercurial nature.
   反復(fù)無常的性格
2. She has a mercurial turn of conversation.
   她談話善轉(zhuǎn)話鋒。

mer.cu.ri.al

adj.（形容詞）
Often Mercurial
常作 Mercurial
Roman Mythology Of or relating to the god Mercury.
【羅馬神話】 墨丘利神的或與之有關(guān)的
Astronomy Of or relating to the planet Mercury.
【天文學(xué)】 水星的：水星的或與水星有關(guān)的
Having the characteristics of eloquence, shrewdness, swiftness, and thievishness attributed to the god Mercury.
機(jī)智的：具有墨丘利神所具備的善辯、精明、敏捷和鬼祟特點(diǎn)的
Containing or caused by the action of the element mercury.
含水銀或由水銀作用引起的
Quick and changeable in temperament; volatile:
脾氣多變或易變的；易變的：
例句：
a mercurial nature.
反復(fù)無常的性格

n.（名詞）
A pharmacological or chemical preparation containing mercury.
水銀劑：含水銀的藥劑或化學(xué)試劑

來源：
Middle English [of the planet Mercury]
中古英語 [水星的]
from Latin mercuri3lis [of the god or planet Mercury]
源自 拉丁語 mercuri3lis [墨丘利神的或水星的]
from Mercurius [Mercury]
源自 Mercurius [墨丘利神，水星]

【引伸】
mercu.rially
adv.（副詞）