uncertain
adjective
un·cer·tain
ˌən-ˈsər-tᵊn 
1
3
: indefinite, indeterminate
the time of departure is uncertain
4
: not certain to occur : problematical
his success was uncertain
5
: not reliable : untrustworthy
an uncertain ally
uncertainly
adverb
Examples of uncertain in a Sentence
The time of departure is still uncertain.
We are still uncertain of the truth.
She remains uncertain about her plans.
I'm uncertain about how to respond.
The cause of the fire is uncertain.
He has an uncertain temper.
They face a financially uncertain future.
Recent Examples on the Web
For example, teachers who are trained in basic school wellness could bring a few moments of mindfulness to a restive classroom, help an uncertain student choose an appealing form of physical activity, or participate with them in comprehensive nutrition education.
—
Dr. James S. Gordon, Time, 18 Dec. 2025
Whether fusion can rescue a money-losing media firm remains uncertain.
—Aamir Khollam, Interesting Engineering, 18 Dec. 2025
Whether the package will go very far is highly uncertain.
—David Lightman, Sacbee.com, 18 Dec. 2025
Melissa Ford Maldonado, director of the Western Hemisphere Initiative at the America First Policy Institute, told Fox News Digital that while the timeline and outcome remain uncertain, the regime’s dependence on oil leaves it uniquely vulnerable.
—Efrat Lachter, FOXNews.com, 18 Dec. 2025
See All Example Sentences for uncertain
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Dr. James S. Gordon, Time, 18 Dec. 2025
Whether fusion can rescue a money-losing media firm remains uncertain.
—Aamir Khollam, Interesting Engineering, 18 Dec. 2025
Whether the package will go very far is highly uncertain.
—David Lightman, Sacbee.com, 18 Dec. 2025
Melissa Ford Maldonado, director of the Western Hemisphere Initiative at the America First Policy Institute, told Fox News Digital that while the timeline and outcome remain uncertain, the regime’s dependence on oil leaves it uniquely vulnerable.
—Efrat Lachter, FOXNews.com, 18 Dec. 2025
See All Example Sentences for uncertain
Cite this Entry
“Uncertain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/uncertain. Accessed 19 Dec. 2025.
Copy CitationKids Definition
uncertain
adjective
un·cer·tain
ˌən-ˈsərt-ᵊn
ˈən-
1
: not definite or fixed
an uncertain quantity
2
a
: not sure
uncertain of the truth
b
: not known for sure
an uncertain claim
3
: likely to change : not dependable
uncertain weather
uncertainly
adverb
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