#1
quicksilver s. [
erratic, fickle, mercurial] liable to sudden unpredictable change; "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"
. wn #2
quicksilver n. [
mercury, hydrargyrum, Hg, atomic number 80] a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
. wn