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 Remember that deals will fluctuate in the final moments of the sale, so bookmark this list to get the latest markdowns before they’re gone for good. — Audrey Lee, Architectural Digest, 7 Oct. 2026 JoCo voter registration increases Schmidt said voter registration can fluctuate for several reasons and typically increases before a November even-year election. — Kendrick Calfee, Kansas City Star, 7 Oct. 2026 And the park-hopper add-on for single-day tickets, which can also fluctuate, increased $5-$10, depending on the day. — Todd Martens, Los Angeles Times, 6 Oct. 2026 Prediction markets experts have warned prices in low-volume markets can fluctuate widely, while spreads between buying and selling can stretch. — Ananya Chetia, CNBC, 6 Oct. 2026 See All Example Sentences for fluctuate

Recent Examples of Synonyms for fluctuate

Verb

While performance varies with outdoor temperatures, heat pumps can deliver substantially more useful heat per unit of energy purchased than conventional electric resistance heating.

— Christopher McFadden, Interesting Engineering, 17 Oct. 2026
Depending on your Galaxy model and Gallery version, the exact location of the tagging controls may vary.

— Kurt Knutsson, FOXNews.com, 17 Oct. 2026

Definition of vary

Verb

The October 19 exercise tested how the vessel handled changing mission requirements and simulated machinery failures without onboard crew intervention.

— Aamir Khollam, Interesting Engineering, 20 Oct. 2026
Most of the dye remained near the surface, although the share changed with the tide and the stratification of the water.

— Alec Luhn, Scientific American, 20 Oct. 2026

Definition of change

Verb

They are discovered well beyond the bounds of the strategic map, where the winds shift, the old answers sink, and the pilot must find the way by dead reckoning.

— Jeff DeGraff, Fortune, 17 Oct. 2026
The autumn sun is drifting southward and the angle of shadows is shifting.

— Dana Kelley, Arkansas Online, 16 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 20 Oct. 2026.

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Synonyms of fluctuate

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