名詞 quick-silver:

1. a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
   同義詞：mercury, quicksilver, hydrargyrum, Hg, atomic number 80

形容詞 quick-silver:

1. liable to sudden unpredictable change
   同義詞：erratic, fickle, mercurial, quicksilver