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Synonym Chooser

How does the adjective unstable differ from other similar words?

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

When can capricious be used instead of unstable?

The synonyms capricious and unstable are sometimes interchangeable, but capricious suggests motivation by sudden whim or fancy and stresses unpredictability.

an utterly capricious critic

When would fickle be a good substitute for unstable?

The words fickle and unstable can be used in similar contexts, but fickle suggests unreliability because of perverse changeability and incapacity for steadfastness.

performers discover how fickle fans can be

When is inconstant a more appropriate choice than unstable?

The words inconstant and unstable are synonyms, but do differ in nuance. Specifically, inconstant implies an incapacity for steadiness and an inherent tendency to change.

an inconstant friend

When could mercurial be used to replace unstable?

Although the words mercurial and unstable have much in common, mercurial implies a rapid changeability in mood.

made anxious by her boss's mercurial temperament

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 unstable Roads and bridges buckled as the city lost power and water, with many newly homeless residents or people living in unstable buildings forced to live on the streets without access to sanitation as aftershocks continued to rock the region. Jen Reeder, Forbes.com, 25 Apr. 2025 Concerns were raised in recent weeks that Musk is spending too much time on DOGE and not enough on Tesla amid an unstable period for the company. Miranda Nazzaro, The Hill, 22 Apr. 2025 These unstable molecules contain oxygen and can severely damage cellular components and even lead to cell death. Elizabeth Rayne, ArsTechnica, 19 Apr. 2025 But the reality is that everyone feels the heat when life is unstable—even therapists. Korin Miller, SELF, 14 Apr. 2025 See All Example Sentences for unstable
Recent Examples of Synonyms for unstable
Adjective
  • Her hands became too unsteady after 2000 to continue drawing.
    Hilarie M. Sheets, New York Times, 4 Apr. 2025
  • Something long and meandering like this: For the next four years, the United States will be an unpredictable, unsteady global superpower run by a fascist oligarchy, in which the people’s representatives cater to a madman’s whim.
    Eli Grober, The New Yorker, 24 Mar. 2025
Adjective
  • Over the past four years, SOFI's annual returns have been considerably more volatile than the S&P 500, with returns of 27% in 2021, -71% in 2022, 116% in 2023, and 55% in 2024.
    Trefis Team, Forbes.com, 29 Apr. 2025
  • Income tax is more volatile and susceptible to the ups and downs within the economy, Greller said.
    Maya Wilkins, Chicago Tribune, 26 Apr. 2025
Adjective
  • After a couple of Shai Gilgeous-Alexander free throws gave the Thunder that precarious three-point lead with 13.2 left, the Nuggets and Nikola Jokic breathing heavy down Oklahoma City’s neck, guard Caruso took a foul on Jokic.
    Luca Evans, Denver Post, 6 May 2025
  • The shoemaker reported a record $9 billion in revenue last year, though the deal comes in a precarious period for retailers amid tariffs.
    Danielle Chemtob, Forbes.com, 6 May 2025
Adjective
  • Some British places are utterly unpredictable to pronounce.
    Maureen O'Hare, CNN Money, 3 May 2025
  • Steering the cart is an obvious responsibility of her role, but navigating the course mentally is just as important due to the unpredictable players on the field.
    Skyler Caruso, People.com, 2 May 2025
Adjective
  • The two men had worked together for years, selling everything from colon cleanses to get-rich-quick advice, before pivoting to crypto with uneven results.
    Eric Lipton, New York Times, 29 Apr. 2025
  • An even newer device, an electronic screener or balance board, measures foot movements as the patient tries to balance themselves on an uneven surface with their eyes open, and then closed.
    Frederick Melo, Twin Cities, 27 Apr. 2025
Adjective
  • That the posing and posturing for the public continued even as the Pentagon descended into turmoil over his rocky leadership seemed to say something, too.
    Jonathan Swan, New York Times, 29 Apr. 2025
  • Smith, standing by a table of unclaimed nametags (Brad, Brock, Craig, Frank, John, Justin, Orlando, Stan), conceded that the path to paradise had been rocky.
    Michael Schulman, New Yorker, 28 Apr. 2025
Adjective
  • A lot of casuals were turned off by the entire extraction shooter concept of losing loot or unbalanced fights.
    Paul Tassi, Forbes.com, 3 May 2025
  • Your choice comes after years of trying to make things work despite the unbalanced responsibilities and disrespect.
    Anna Pulley, Chicago Tribune, 30 Apr. 2025

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Cite this Entry

“Unstable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unstable. Accessed 13 May. 2025.

More from Merriam-Webster on unstable

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