You searched for: “mercurial
mercurial (adjective), more mercurial, most mercurial
1. Characterizing someone's behavior or mood as being flighty or unpredictable: Suddenly, without warning, Janet was really mercurial and completely changed her mind and decided not to take the others to the movie in her car.
2. Referring to a person who is bright, lively, and quick: Tom's English teacher was quite mercurial because she always kept the attention of all the students with her witty comments and very animated examples of the terms she was explaining.
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