Synonym Chooser

How does the adjective mercurial differ from other similar words?

Some common synonyms of mercurial are capricious, fickle, inconstant, and unstable. While all these words mean "lacking firmness or steadiness (as in purpose or devotion)," mercurial implies a rapid changeability in mood.

made anxious by her boss's mercurial temperament

When could capricious be used to replace mercurial?

The words capricious and mercurial can be used in similar contexts, but capricious suggests motivation by sudden whim or fancy and stresses unpredictability.

an utterly capricious critic

When is fickle a more appropriate choice than mercurial?

While in some cases nearly identical to mercurial, fickle suggests unreliability because of perverse changeability and incapacity for steadfastness.

performers discover how fickle fans can be

When is it sensible to use inconstant instead of mercurial?

The synonyms inconstant and mercurial are sometimes interchangeable, but inconstant implies an incapacity for steadiness and an inherent tendency to change.

an inconstant friend

When would unstable be a good substitute for mercurial?

Although the words unstable and mercurial have much in common, unstable implies an incapacity for remaining in a fixed position or steady course and applies especially to a lack of emotional balance.

too unstable to hold a job

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of mercurial Pressure academic departments against hiring any professors whose social media comments or areas of research will catch the eye of mercurial government officials? Sarah McLaughlin, Twin Cities, 4 June 2025 His mercurial approach has taken the financial markets on a wild ride of sell-offs and rallies that have produced a general sense of uncertainty. Arkansas Online, 31 May 2025 After a hamstring injury sidelined the mercurial winger for a few weeks in March, Lozano has steadily made a case to Mexico coach Javier Aguirre with five goals and six assists in 12 games. Mark Zeigler, San Diego Union-Tribune, 30 May 2025 National spirits California’s mercurial economic sentiments aren’t an oddity. Jonathan Lansner, Oc Register, 27 May 2025 See All Example Sentences for mercurial
Recent Examples of Synonyms for mercurial
Adjective
  • The fire had to feel alive, volatile, and credible—a force the actors had to confront in real time.
    JP Mangalindan, Time, 4 June 2025
  • The Behavioral Finance Connection When the market’s volatile, fear drives behavior.
    Meredith Moore, Forbes.com, 4 June 2025
Adjective
  • Entrepreneurs who want to survive must meet our current reality by staying as flexible as the market is unpredictable.
    Cynthia Pong, Forbes.com, 8 June 2025
  • Love can get a little wild and unpredictable this month.
    Valerie Mesa, People.com, 6 June 2025

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Cite this Entry

“Mercurial.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/mercurial. Accessed 17 Jun. 2025.

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