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 After years of uncertain funding, the city plans to finally complete the project next year. — Charlotte Observer, 21 Aug. 2026 None of which is to necessarily suggest that Haaland will have an easy go of it in 2026-27, as City enters the new season in somewhat uncertain circumstances. — Anthony Crupi, Sportico.com, 21 Aug. 2026 It is revealed by what the relationship can hold when something is uncertain, disappointing, or hard to say. — K.h. Koehler, Freep.com, 20 Aug. 2026 Forecasters see the potential for extreme heat but details on timing and severity remain uncertain. — Mateo Rosiles, USA Today, 20 Aug. 2026 See All Example Sentences for uncertain

Recent Examples of Synonyms for uncertain

Adjective

The man had been shot during a volatile time in the city, and the disposal of his body appears to have been planned.

— Elizabeth Wolfe, CNN Money, 21 Aug. 2026
Sandisk showcased its BiCS8 and BiCS10 NAND technologies and highlighted HBF's potential to provide high-capacity, high-performance non-volatile storage, supplementing or replacing HBM.

— Thomas Coughlin, Forbes.com, 21 Aug. 2026

Definition of volatile

Adjective

Victims’ families and experts are unsure the higher amounts will be enough to get tipsters to come forward, citing people's fears and distrust of the federal government.

— ABC News, ABC News, 25 Aug. 2026
Victims’ families and experts are unsure the higher amounts will be enough to get tipsters to come forward, citing people’s fears and distrust of the federal government.

— Sarah Raza, Los Angeles Times, 25 Aug. 2026

Definition of unsure

Adjective

Klayton Adams wants his offense to be creative and complex, physical and unpredictable, to break rules but still feel realistic.

— Jon Machota, New York Times, 21 Aug. 2026
Later, the Moon opposes unpredictable Uranus, shifting schedules, conversations, or logistics.

— Tarot.com, Baltimore Sun, 20 Aug. 2026

Definition of unpredictable

Adjective

The tie-up should help some skeptical investors grow more confident that Salesforce — thanks to troves of proprietary customer data housed within its applications — has a role to play in this new AI world.

— Kevin Stankiewicz, CNBC, 27 Aug. 2026
Price likened his attraction to the format to his early embrace of streaming entertainment back in the days when Hollywood remained skeptical of its staying power.

— Katie Kilkenny, HollywoodReporter, 26 Aug. 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

Luke Halls’ video and projections add another layer of visual unease, allowing screens and technology inside the home to become as suspicious as its shadowy corners.

— Dave Quinn, PEOPLE, 26 Aug. 2026
As Joan Acocella wrote for this magazine, in 2008, a suspicious number of cures happen to include alcohol as a main ingredient.

— Shayla Love, New Yorker, 26 Aug. 2026

Definition of suspicious

Adjective

In a world where prices continue to rise and current events feel unstable, the proliferation of little treat culture signals a small-but-mighty act by its advocates to exert a modicum of control (and joy) over their day.

— The Bon Appétit Staff, Bon Appetit Magazine, 24 Aug. 2026
Glutathione is an antioxidant made primarily in the liver that neutralizes other unstable molecules that attack the body and cause cellular damage.

— ABC News, ABC News, 23 Aug. 2026

Definition of unstable

Adjective

Jalen Coker’s three-year, $36 million contract solidified him as Carolina’s WR2, and his Round 11 ADP looks like a bargain compared to Tetairoa McMillan’s Round 4 price given the target competition around Bryce Young’s inconsistent passing attack.

— Charlotte Observer, Charlotte Observer, 21 Aug. 2026
The pitch had inconsistent shape and was difficult to command.

— Cody Stavenhagen, New York Times, 21 Aug. 2026