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English definition of “mercurial”

mercurial

adjective uk   /mɜːˈkjʊə.ri.əl/ us    /mɜːrˈkjʊr.i-/

mercurial adjective (quick)

literary changing suddenly and often: a mercurial temperament She was entertaining but unpredictable, with mercurial mood swings. literary intelligent, enthusiastic, and quick: a mercurial mind/wit

mercurial adjective (related to mercury)

specialized medical containing or caused by mercury: mercurial drugs
(Definition of mercurial from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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