quicksilver(a)
n.a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures 同义词：mercuryhydrargyrumHgatomic number 80
adj.liable to sudden unpredictable change"a quicksilver character, cool and willful at one moment, utterly fragile the next"
同义词：erraticficklemercurial