UNCERTAIN Synonyms: 104 Similar and Opposite Words

uncertain

adjective

ˌən-ˈsər-tᵊn

Definition of uncertain

as in volatile

likely to change frequently, suddenly, or unexpectedly the stifling heat would occasionally be relieved by an uncertain breeze

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in unsure

not feeling sure about the truth, wisdom, or trustworthiness of someone or something never uncertain of her political beliefs or judgment, she was a decisive and fearless leader

Synonyms & Similar Words

Antonyms & Near Antonyms

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 uncertain The final outcome remains uncertain as vote counting continues, including ballots cast by soldiers and other voters using special voting procedures. — Efrat Lachter, FOXNews.com, 28 Oct. 2026 As a result, Soviet laboratories could often find room for experiments involving new and uncertain phenomena. — The Editors, JSTOR Daily, 28 Oct. 2026 Whether the two companies can perfect the engineering and fly the uncrewed missions in the maximum 18 months that will elapse between the launch of Artemis III and the flight of Artemis IV at the end of 2028 is uncertain. — Jeffrey Kluger, Time, 28 Oct. 2026 Ideas expressed in the piece The column argues that Democrats are strongly favored to take the House, though the size of their majority is uncertain. — Los Angeles Times, 28 Oct. 2026 See All Example Sentences for uncertain

Recent Examples of Synonyms for uncertain

Adjective

To their credit, the creative minds behind the Absolute series don’t bother masking their politics — an especially bold move for anyone working in an industry with an often reactive and volatile fandom.

— Christopher Cruz, Rolling Stone, 28 Oct. 2026
Still, the prospect of additional supply from American producers remains uncertain, with companies reluctant to commit to major new investments amid volatile prices and geopolitical risks.

— Lee Ying Shan, CNBC, 26 Oct. 2026

Definition of volatile

Adjective

The Salt Lake County clerk requests assistance to secure the polls, but the sheriff, unsure about jurisdiction, declines.

— Barton Gellman, New Yorker, 25 Oct. 2026
The equipment truck had left spring training in Tempe, Arizona, and was in Salt Lake City, unsure where to go, when Selig called traveling secretary Tommy Ferguson, who had held the same job with the Braves.

— ABC News, ABC News, 24 Oct. 2026

Definition of unsure

Adjective

Rashida Jones and Will McCormack wrote the screenplay for the film that follows two couples at a dinner party that turns into an unpredictable evening exposing messy relationships and desires.

— Beatrice Verhoeven, HollywoodReporter, 28 Oct. 2026
The Serbian leader had long been seen as an unpredictable annoyance, and his balancing act wasn’t particularly subtle.

— Brady Knox, The Washington Examiner, 27 Oct. 2026

Definition of unpredictable

Adjective

Progressives like Melat Kiros have signaled their votes for Jeffries might be up for grabs unless their leadership embraces more left-leaning policies, but most Democrats are skeptical about major defections.

— Nicholas Wu, semafor.com, 27 Oct. 2026
Gabriel, however, is more skeptical, arguing that infrastructure carries the incentives of the model that built it, making a brand with less influence likely to struggle to resist a parent company oriented around speed, efficiency, and growth.

— Jessica Binns, Vogue, 26 Oct. 2026

Definition of skeptical

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

The authentication process combines human expertise and AI integration to flag any suspicious activity and ensure that listings follow commercial industry standards.

— Sophie Lou Wilson, Vogue, 26 Oct. 2026
What readers are saying The comments discuss a case involving a person who sent letters containing a suspicious substance, with many commenters criticizing the individual's intelligence for including his return address.

— Violet Jira, Washington Post, 26 Oct. 2026

Definition of suspicious

Adjective

Water essentially acts as a catalyst that spontaneously creates particles known as hydroxyl radicals, unstable molecules linked to aging and disease.

— Michael Hawthorne, Chicago Tribune, 22 Oct. 2026
If a tree appears diseased, unstable or at risk of falling, consider documenting the problem and notifying the owner in writing.

— Sacbee.com, Sacbee.com, 22 Oct. 2026

Definition of unstable

Adjective

This time around, both teams are coming in after inconsistent regular seasons, but both have been much better over the last five weeks.

— Steve Millar, Chicago Tribune, 22 Oct. 2026
The association with the Human Rights Campaign could create more confusion about Talarico’s stance on the medical issue, as his position has come into question through his inconsistent comments.

— Hudson Crozier, The Washington Examiner, 21 Oct. 2026