FLUCTUATE Synonyms: 19 Similar and Opposite Words

Q: How does the verb 'fluctuate' differ from other similar words?

Some common synonyms of fluctuate are oscillate , sway , swing , undulate , vibrate , and waver . While all these words mean "to move from one direction to its opposite," fluctuate suggests constant irregular changes of level, intensity, or value. // fluctuating interest rates

Q: When would 'oscillate' be a good substitute for 'fluctuate'?

Although the words oscillate and fluctuate have much in common, oscillate stresses a usually regular alternation of direction. // an oscillating fan

Q: Where would 'sway' be a reasonable alternative to 'fluctuate'?

While in some cases nearly identical to fluctuate , sway implies a slow swinging or teetering movement. // trees swaying in the breeze

Q: When can 'swing' be used instead of 'fluctuate'?

The synonyms swing and fluctuate are sometimes interchangeable, but swing implies a movement of something attached at one end or one side. // the door suddenly swung open

Q: When is it sensible to use 'undulate' instead of 'fluctuate'?

In some situations, the words undulate and fluctuate are roughly equivalent. However, undulate suggests a gentle wavelike motion. // an undulating sea of grass

Q: When might 'vibrate' be a better fit than 'fluctuate'?

While the synonyms vibrate and fluctuate are close in meaning, vibrate suggests the rapid oscillation of an elastic body under stress or impact. // the vibrating strings of a piano

Q: When could 'waver' be used to replace 'fluctuate'?

The words waver and fluctuate can be used in similar contexts, but waver stresses irregular motion suggestive of reeling or tottering. // the exhausted runner wavered before collapsing

fluctuate

verb

ˈflək-chə-ˌwāt

Definition of fluctuate

as in to vary

to pass from one form, state, or level to another temperatures will fluctuate between the low and high 50s today

Synonyms & Similar Words

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How does the verb fluctuate differ from other similar words?

Some common synonyms of fluctuate are oscillate, sway, swing, undulate, vibrate, and waver. While all these words mean "to move from one direction to its opposite," fluctuate suggests constant irregular changes of level, intensity, or value.

fluctuating interest rates

When would oscillate be a good substitute for fluctuate?

Although the words oscillate and fluctuate have much in common, oscillate stresses a usually regular alternation of direction.

an oscillating fan

Where would sway be a reasonable alternative to fluctuate?

While in some cases nearly identical to fluctuate, sway implies a slow swinging or teetering movement.

trees swaying in the breeze

When can swing be used instead of fluctuate?

The synonyms swing and fluctuate are sometimes interchangeable, but swing implies a movement of something attached at one end or one side.

the door suddenly swung open

When is it sensible to use undulate instead of fluctuate?

In some situations, the words undulate and fluctuate are roughly equivalent. However, undulate suggests a gentle wavelike motion.

an undulating sea of grass

When might vibrate be a better fit than fluctuate?

While the synonyms vibrate and fluctuate are close in meaning, vibrate suggests the rapid oscillation of an elastic body under stress or impact.

the vibrating strings of a piano

When could waver be used to replace fluctuate?

The words waver and fluctuate can be used in similar contexts, but waver stresses irregular motion suggestive of reeling or tottering.

the exhausted runner wavered before collapsing

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 fluctuate During perimenopause, estrogen levels can fluctuate dramatically (for months or even years) before settling at consistently lower levels. — Cheyenne Buckingham, Washington Post, 24 Oct. 2026 Quarterback play is … OK Florida’s offense has fluctuated in form and quality this season. — Noah White, Miami Herald, 23 Oct. 2026 Regional funds have helped fill some of that void, but Shawky says their resources can fluctuate, leaving filmmakers uncertain about available support. — Essie Assibu, Variety, 23 Oct. 2026 This issue is particularly relevant in California, where billionaire wealth is often tied to technology companies, startup equity and other illiquid assets whose valuations can fluctuate sharply and become contentious. — Trevor Laurence Jockims, CNBC, 22 Oct. 2026 See All Example Sentences for fluctuate

Recent Examples of Synonyms for fluctuate

Verb

The measures in Arizona, California, Colorado, Nevada, North Carolina, and Ohio vary in scope.

— Kaelan Deese, The Washington Examiner, 25 Oct. 2026
Microsoft notes that availability, purchasing options, eligible games, and cloud gaming features may vary by market, device, account eligibility, and preview ring.

— Will McCurdy, PC Magazine, 24 Oct. 2026

Definition of vary

Verb

Election forecaster Cook Political Report shifted Ohio’s gubernatorial race toward Democratic candidate Amy Acton on Friday after a week of backlash over an ad Republican Vivek Ramaswamy ran featuring her estranged mother.

— Molly Parks, The Washington Examiner, 24 Oct. 2026
Miller points out that the numbers are extremely volatile, and could shift big time by election day.

— Shawn Tully, Fortune, 24 Oct. 2026

Definition of shift

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flubs

fluctuate

fluctuated

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“Fluctuate.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fluctuate. Accessed 28 Oct. 2026.

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Synonyms of fluctuate

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