mercurial [mɜ:rˈkjʊriəl]

例句:

• Emily's mercurial temperament made her difficult to live with.
  埃米莉脾气反复无常，很难与她相处。
  
• He is a complicated man— moody, mercurial, with a melancholy streak.
  他是一个性格复杂的人——喜怒无常，反复多变，有些忧郁寡欢。
  
• Meanwhile, his mercurial character has only got more erratic.
  同时, 喜乐无常的个性使小泽变得更加难以捉摸.
  
• The piano-playing prodigy and his mercurial father were a hit.
  来自WSJ
• She was mercurial, able to change her mind or her mood.
  来自C. Priest
• General Karimi is charismatic and mercurial.
  来自NEWYORKER