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Trump’s iron grip on the Republican Party is a function of his irrationality, his limitless egotism and his mercurial whims.

Pressure academic departments against hiring any professors whose social media comments or areas of research will catch the eye of mercurial government officials?

To get to play with someone like Jeff, who is so mercurial and cerebral yet is so playful — and then he goes dark — was a joy.

Several coaches who have worked with him have described to BBC Sport a mercurial forward who can be "introverted" - a quiet, unassuming young man off the pitch who transforms into the main attraction on it.

The "hobbling" scene—she uses a sledgehammer to break Paul’s ankles—elevated her to canonical b***h status: a cunning, brutal and mercurial harridan who hides her malice behind a folksy façade.