Mercurial is mood swings: The mercurial patient had mood swings frequently.
Since becoming an adolescent, my daughter's personality has become very mercurial, you never know how she'll react to something.
He has mercurial temperment.
When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).
His mercurial disposition ultimately displaced him from his advisory posting.
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