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 Although inflation is a central part of modern cosmology, the physics that drove it remains uncertain. — Kaif Shaikh, Interesting Engineering, 20 Oct. 2026 Anthropic is seeking to list as soon as November, potentially at a valuation of up to $2 trillion, although that figure remains uncertain. — Ella Chakarian, Los Angeles Times, 20 Oct. 2026 Each week, Scanlon will sit down with guests who have something to teach us about how to build a meaningful career in this uncertain moment, from economists to journalists, farmers to comedians. — Vox Communications, Vox, 20 Oct. 2026 In its uncertain tonality and zany humor that falls flat, that’s the Waititi film that Klara and the Sun most resembles. — David Rooney, HollywoodReporter, 20 Oct. 2026 See All Example Sentences for uncertain

Recent Examples of Synonyms for uncertain

Adjective

Instead, the name of the game is to create pockets of stability in an inherently volatile business.

— Tim McDonnell, semafor.com, 22 Oct. 2026
Targeting a smaller raise could protect a higher valuation, but might trigger skepticism over how the AI firm will fund its massive infrastructure needs in a volatile bond market.

— Justin Zacks, CNBC, 21 Oct. 2026

Definition of volatile

Adjective

Residents said most of the children killed lived in the Dir Colony neighborhood, where the school is located, leaving them unsure which bereaved family to visit first to offer condolences.

— Arkansas Online, Arkansas Online, 16 Oct. 2026
Hujar is unsure of his prospects, curious where his talent and ambition might lead, embedded in a community that may or may not take him there.

— Literary Hub, Literary Hub, 16 Oct. 2026

Definition of unsure

Adjective

Holy Cross and the Lower Ninth Ward that borders it are known for their quiet ambiance, grocery store deserts, and drawbridge access with unpredictable hours.

— Nina Corcoran, Pitchfork, 21 Oct. 2026
Frost leaves orchard with few apples to harvest The unpredictable weather has forced the farm to adjust to get through the season.

— Tara Lynch, CBS News, 21 Oct. 2026

Definition of unpredictable

Adjective

Others are skeptical the task force can accomplish much in such a short time period, arguing that eventually sweeping new legislation will be needed to regulate AI.

— Ashley Gold, semafor.com, 19 Oct. 2026
Though Netflix is profitable, analysts say the company hasn’t produced enough hits and are skeptical of its plans to grow its subscriber base.

— Samantha Masunaga, Los Angeles Times, 19 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

For all current and former Florida residents, FLHSMV recommended taking precautions, including monitoring financial accounts and reviewing credit reports for any suspicious activity.

— Ashley Belanger, ArsTechnica, 19 Oct. 2026
Researchers at iVerify discovered it while investigating a suspicious infection in August 2026.

— Kurt Knutsson, FOXNews.com, 19 Oct. 2026

Definition of suspicious

Adjective

Since Oppenheim and Fielder can’t record her there, their contact is mediated through her seemingly unstable and controlling husband, Billy Evans.

— Jackson McHenry, Vulture, 17 Oct. 2026
Lycopene can help protect blood vessels from the damaging effects of unstable molecules known as free radicals.

— MD Published, Verywell Health, 17 Oct. 2026

Definition of unstable

Adjective

More problematic was the character’s heritage; he’s supposed to be half-English and half-Paraguayan, and to say Gere’s accent is inconsistent would be charitable.

— Jim Hemphill, IndieWire, 16 Oct. 2026
The Packers have been inconsistent but should be able to handle their business at home.

— Los Angeles Times, Los Angeles Times, 15 Oct. 2026