INCONSTANT Synonyms: 124 Similar and Opposite Words

Q: How does the adjective 'inconstant' differ from other similar words?

Some common synonyms of inconstant are capricious , fickle , mercurial , and unstable . While all these words mean "lacking firmness or steadiness (as in purpose or devotion)," inconstant implies an incapacity for steadiness and an inherent tendency to change. // an inconstant friend

Q: When could 'capricious' be used to replace 'inconstant'?

The meanings of capricious and inconstant largely overlap; however, capricious suggests motivation by sudden whim or fancy and stresses unpredictability. // an utterly capricious critic

Q: Where would 'fickle' be a reasonable alternative to 'inconstant'?

While in some cases nearly identical to inconstant , fickle suggests unreliability because of perverse changeability and incapacity for steadfastness. // performers discover how fickle fans can be

Q: When can 'mercurial' be used instead of 'inconstant'?

While the synonyms mercurial and inconstant are close in meaning, mercurial implies a rapid changeability in mood. // made anxious by her boss's mercurial temperament

Q: When would 'unstable' be a good substitute for 'inconstant'?

The words unstable and inconstant can be used in similar contexts, but 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

inconstant

adjective

(ˌ)in-ˈkän(t)-stənt

Definition of inconstant

as in volatile

likely to change frequently, suddenly, or unexpectedly our windjammer sailed wherever the inconstant winds took us

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in traitorous

not true in one's allegiance to someone or something an inconstant but always entertaining friend

Synonyms & Similar Words

Antonyms & Near Antonyms

Synonym Chooser

How does the adjective inconstant differ from other similar words?

Some common synonyms of inconstant are capricious, fickle, mercurial, and unstable. While all these words mean "lacking firmness or steadiness (as in purpose or devotion)," inconstant implies an incapacity for steadiness and an inherent tendency to change.

an inconstant friend

When could capricious be used to replace inconstant?

The meanings of capricious and inconstant largely overlap; however, capricious suggests motivation by sudden whim or fancy and stresses unpredictability.

an utterly capricious critic

Where would fickle be a reasonable alternative to inconstant?

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

performers discover how fickle fans can be

When can mercurial be used instead of inconstant?

While the synonyms mercurial and inconstant are close in meaning, mercurial implies a rapid changeability in mood.

made anxious by her boss's mercurial temperament

When would unstable be a good substitute for inconstant?

The words unstable and inconstant can be used in similar contexts, but 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 inconstant The self is a shifting, inconstant phenomenon, brain and body ever transforming in time and space, with no clear delineation between what is self and what is other. — Lauren Groff, The Atlantic, 20 Aug. 2025 If the United States is an unreliable partner and a source of chaos these countries will turn elsewhere, building new security and trade alliances that don’t depend on the inconstant, waning superpower. — Lydia Polgreen, Mercury News, 27 May 2025 Much like a patient who fails to finish a course of antibiotics, inconstant policies may incur all the costs and none of the benefits. — David Carlin, Forbes, 24 Mar. 2025 The key finding is that as the distance grows greater, the coupling stops growing, and the inconstant constant becomes constant once more. — Stanley J. Brodsky, Scientific American, 16 Apr. 2024 See All Example Sentences for inconstant

Recent Examples of Synonyms for inconstant

Adjective

Instead, the name of the game is to create pockets of stability in an inherently volatile business.

— Tim McDonnell, semafor.com, 22 Oct. 2026
Targeting a smaller raise could protect a higher valuation, but might trigger skepticism over how the AI firm will fund its massive infrastructure needs in a volatile bond market.

— Justin Zacks, CNBC, 21 Oct. 2026

Definition of volatile

Adjective

Telemachus’ lone contribution is killing Melanthius, the traitorous Ithacan farmhand, thus preventing him from continuing to arm the suitors.

— Marlow Stern, Variety, 17 July 2026
And at the very center of Hell is Satan himself, the traitorous Archangel Lucifer, depicted as a monstrous creature with wings and three heads.

— Keith Cooper, Space.com, 11 May 2026

Definition of traitorous

Adjective

Holy Cross and the Lower Ninth Ward that borders it are known for their quiet ambiance, grocery store deserts, and drawbridge access with unpredictable hours.

— Nina Corcoran, Pitchfork, 21 Oct. 2026
Frost leaves orchard with few apples to harvest The unpredictable weather has forced the farm to adjust to get through the season.

— Tara Lynch, CBS News, 21 Oct. 2026

Definition of unpredictable

Adjective

Yet, the company’s machines really could only perform a limited number of tests and often produced unreliable results.

— Marco Quiroz-Gutierrez, Fortune, 21 Oct. 2026
Potential applications include autonomous drones, submarines and other vehicles operating in environments where satellite navigation is unreliable.

— Neetika Walter, Interesting Engineering, 17 Oct. 2026

Definition of unreliable

Adjective

Rigorous, blustery winter; winding sleety spring; hot, moist enervating summer; changeful autumn with its dog-days; these are absolutely unknown.

— San Diego Union-Tribune, San Diego Union-Tribune, 1 Jan. 2023
Hers is the kind of face that inspires directors to tight framing — gleaming, as if smoothed from marble, and yet somehow pliant, changeful.

— Jordan Kisner Jack Davison, New York Times, 11 Oct. 2022

Definition of changeful

Adjective

Experts worry federal law enforcement could potentially use those false claims — or others generated this year — as pretext to try to seize ballots during the counting period, or interfere in the process in some other way.

— Miles Parks, NPR, 22 Oct. 2026
The false polling data from Wedgewood Polls consistently favored Democrats, particularly progressive candidates.

— Hailey Bullis, The Washington Examiner, 22 Oct. 2026

Definition of false

Adjective

Since Oppenheim and Fielder can’t record her there, their contact is mediated through her seemingly unstable and controlling husband, Billy Evans.

— Jackson McHenry, Vulture, 17 Oct. 2026
Lycopene can help protect blood vessels from the damaging effects of unstable molecules known as free radicals.

— MD Published, Verywell Health, 17 Oct. 2026

Definition of unstable

Adjective

Time is running out for a Republican Party led astray by a president whose treacherous behavior mimics those assigned to the lowest level of Dante’s hell.

— Bob Kustra, Chicago Tribune, 22 Oct. 2026
Russell doesn’t traffick in any of that, and screenwriter Christopher Logue refuses to pathologize the two, focusing instead on the untamed beauty of their relationship, which was romantic, familiar, treacherous, and pure.

— Juan A. Ramírez, Vulture, 20 Oct. 2026

Definition of treacherous

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inconstancy

inconstant

incontestable

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“Inconstant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/inconstant. Accessed 25 Oct. 2026.

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Synonyms of inconstant

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