mercurial
adjective uk/mɜːˈkjʊə.ri.əl/ us/mɝːˈkjʊr.i.əl/
(QUICK)
literary多变的，反复无常的
changing suddenly and often
a mercurial temperament 易变的性情
She was entertaining but unpredictable, with mercurial mood swings. 她很会逗人开心，但性格让人捉摸不透，情绪反复无常。
literary机智活跃的
intelligent, enthusiastic, and quick
a mercurial mind/wit 活跃的思维／机敏的才智
(RELATING TO MERCURY)
medical specialized含汞的;因汞引起的
containing or caused by mercury
mercurial drugs 含汞的药物