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 The number of food recalls classified by the FDA has fluctuated sharply over the past decade. — Dian Zhang, USA Today, 28 Aug. 2026 Since the cash creators earn from views on platforms like TikTok, YouTube, and Facebook can fluctuate, affiliate links offer more consistent income. — Ct Jones, Rolling Stone, 25 Aug. 2026 That said, all of these interest earnings are approximate as rates can and will fluctuate, especially if the Federal Reserve issues rate hikes or cuts while the account is open. — Matt Richardson, CBS News, 25 Aug. 2026 There’s an Iran war that won’t end, heightening anxieties, plus fluctuating trade policies for those who deal with foreign goods or markets. — Jonathan Lansner, Oc Register, 25 Aug. 2026 See All Example Sentences for fluctuate

Recent Examples of Synonyms for fluctuate

Verb

Advocates hope — with varying degrees of optimism — that the result will help close the gaping disparities in how different demographic groups perform.

— Theo Peck-Suzuki, Hartford Courant, 31 Aug. 2026
School district rules While California has some laws governing electric bicycles, school districts may have varying rules.

— Madison Smalstig, Sacbee.com, 31 Aug. 2026

Definition of vary

Verb

Dodgers’ brass has refrained from dipping into its robust pool of outfield prospects, but the open roster spot could change their thinking.

— Katie Woo, New York Times, 31 Aug. 2026
Unlocking the true nature of dark energy and dark matter could help astronomers understand what the universe is made of, how its expansion has changed over time, and if there is more to understanding gravity than meets the eye.

— Ashley Strickland, CNN Money, 30 Aug. 2026

Definition of change

Verb

But Boone removed him from the lineup before the top of the fourth, shifting José Caballero to shortstop and bringing in Amed Rosario to play third base.

— Tyler Kepner, New York Times, 30 Aug. 2026
Monthly sales at Poppy Rose have climbed from roughly $30,000 to hundreds of thousands of dollars since the business shifted from Etsy to TikTok Shop and adopted print-on-demand.

— Ryan Brennan, Miami Herald, 30 Aug. 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 2 Sep. 2026.

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Synonyms of fluctuate

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