Definition: a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
Definition: any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Definition: liable to sudden unpredictable change
Usage: erratic behavior; fickle weather; mercurial twists of temperament; a quicksilver character, cool and willful at one moment, utterly fragile the next
Definition: such that alteration is possible; having a marked tendency to change
Usage: changeable behavior; changeable moods; changeable prices