American English

Definition of mercurial adjective from the Oxford Advanced American Dictionary



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  1. 1(literary) often changing or reacting in a way that is unexpected synonym volatile Emily's mercurial temperament made her difficult to live with. Advertising is a mercurial business.
  2. 2(literary) lively and quick a brilliant, mercurial mind
  3. 3(technology) containing Mercury mercurial compounds
See the Oxford Advanced Learner's Dictionary entry: mercurial