mer·cu·ri·al 
/mɚˈkjɚrijəl/ adjective
/mɚˈkjɚrijəl/ adjective [more mercurial; most mercurial] 1 a : changing moods quickly and often — used to describe someone who often changes from being happy to being angry or upset in a quick and unexpected way ▪ a mercurial movie star ▪ She had a mercurial personality/disposition. ▪ mercurial behavior
b : changing often : very changeable
▪ mercurial weather 2 : very lively and quick
▪ mercurial wit
b : changing often : very changeable
▪ mercurial weather
▪ mercurial wit
