"quicksilver" in the noun sense
1. mercury, quicksilver, hydrargyrum, Hg, atomic number 80
a heavy silvery toxic univalent and bivalent metallic element the only metal that is liquid at ordinary temperatures
"quicksilver" in the adjective sense
1. erratic, fickle, mercurial, quicksilver
liable to sudden unpredictable change
"mercurial twists of temperament"
"a quicksilver character, cool and willful at one moment, utterly fragile the next"
Source: WordNet® (An amazing lexical database of English)
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