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

Technology stocks — a key driver of rallies in recent years — have been notably volatile in 2026.

— Chloe Taylor, CNBC, 11 Nov. 2026
In the case of foods and certain beverages, breakdown of the amino acids results in volatile Strecker aldehydes, which are responsible for aroma, and in aminoketones, which impart flavor and coloration, particularly browning.

— Encyclopedia Britannica, Encyclopedia Britannica, 9 Nov. 2026

Definition of volatile

Adjective

The book is centered on a traitorous CIA officer who has found refuge with the Russian mafia with plans to kill Reece.

— Peter White, Deadline, 5 Nov. 2026
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

Definition of traitorous

Adjective

Perhaps the arrival of fall and winter, and with it rougher and more unpredictable seas, will reduce the flow.

— Pedro Portal, Miami Herald, 12 Nov. 2026
Potential applications include manufacturing, space exploration and search-and-rescue missions, where robots may need to navigate unpredictable environments, manipulate objects and adapt to changing requirements.

— Jijo Malayil, Interesting Engineering, 12 Nov. 2026

Definition of unpredictable

Adjective

According to Rose, weeks without rain can force them to conserve water, while prolonged storms can leave them with less solar power and unreliable Wi-Fi.

— Tereza Shkurtaj, PEOPLE, 9 Nov. 2026
If its data becomes outdated or its model fails to account for changing conditions, its predictions can become unreliable.

— Kaif Shaikh, Interesting Engineering, 8 Nov. 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

Lina Attalah, a co-founder and editor-in-chief of Mada Masr, is challenging a one-year prison sentence and a fine imposed in absentia on charges of operating a website without a license and spreading false news.

— Arkansas Online, Arkansas Online, 12 Nov. 2026
Numerous European carriers were hit with false bomb threats last week, including Irish airlines Aer Lingus and Ryanair, Hungarian carrier Wizz Air and Polish Airlines.

— Aliss Higham, MSNBC Newsweek, 11 Nov. 2026

Definition of false

Adjective

The glow of many Turners has dwindled, thanks to unstable pigments, but here is an immaculate exception.

— Anthony Lane, New Yorker, 5 Nov. 2026
And while unstable coalitions repeatedly fused and dissolved in the halls of power, outside these halls pipes burst and roads crumbled.

— Ryan Lenora Brown, Christian Science Monitor, 5 Nov. 2026

Definition of unstable

Adjective

Besides, second terms--and especially their final two years--have proved treacherous for every recent president, including Reagan, who survived a major scandal involving arms sales to Iran.

— Arkansas Online, Arkansas Online, 12 Nov. 2026
Except, counters Soll, that the placement of the giraffe is treacherous because the front door swings right in its path.

— Leonora Epstein, Architectural Digest, 11 Nov. 2026

Definition of treacherous

Browse Nearby Words

inconstancy

inconstant

incontestable

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Style

“Inconstant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/inconstant. Accessed 14 Nov. 2026.

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Synonyms of inconstant

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