Quicksilver (adjective)
definition:
liable to sudden unpredictable change
example:
"If you want to stay in one place, don't ask the children where they want to go; they are quicksilver."
Synonyms
ErraticQuicksilver (noun)
definition:
liquid mercury
example:
"The beaker broke and quicksilver ran across the lab station and beaded on the floor."
Synonyms
Mercury