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Free sign upThe phrase "mercurial" is correct and usable in written English.
It can be used to describe someone or something that is subject to sudden or unpredictable changes in mood or behavior. Example: "Her mercurial temperament made it difficult for her friends to know how she would react in any given situation."
Dictionary
mercurial
adjective
(often capitalized, see ) Pertaining to the planet Mercury.
Exact(60)
He hasn't been to Villa Bianca for two years, and the last time was at the invitation of Alan Yentob (who was making a film about Davies's mercurial and often unsung gift and influence).
In Swann's estimation Pietersen was "never the right man to captain England" – a position the mercurial batsman held only fleetingly before he and the coach Peter Moores both lost their jobs at the start of 2009.
He was a whirlwind of a person, bright, mercurial, great fun.
The mercurial Russian had just upset Pete Sampras for the 2000 US Open title when he joined Letterman to discuss the merits of vodka for breakfast and Anna Kournikova's Grand Slam prospects.
Critics agreed Gehry's deconstructed meringue of sweeping metal, which opened in 1997, was a work of "mercurial brilliance".
I had done the production in the West End with Mark Rylance, so I was looking for someone who could match that same mercurial brilliance; something that wouldn't be just a piece of bravura acting.
The brilliantly mercurial Retrograde, along with all the songs here, were good enough to reverse a retrograde Mercury.
And even Sadat's fans grew to fear his increasingly mercurial temper and were relieved by his exit.
For most of the past few years he has been fighting for supremacy not with Mr Milosevic but with other Serb opposition leaders, notably the mercurial Vuk Draskovic.
That is no doubt helped by the fact that its corporate biography is so closely bound up with the mercurial Mr Jobs, a rare showman in his industry.
Meanwhile, a mercurial newspaperman appears to be a friend and a socialist sympathiser, but he soon changes tack, hinting that he knows too much.
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