Synonyms of certainty

certainty

noun

ˈsər-tᵊn-tē 

1

as in assurance

a state of mind in which one is free from doubt

I have full certainty that I'll pass the test

Synonyms & Similar Words

• assurance
• confidence
• satisfaction
• conviction
• certitude
• assuredness
• sureness
• surety
• positiveness
• cocksureness
• doubtlessness
• determination
• face
• dogmatism
• authoritarianism
• resolution
• decisiveness
• firmness
• resolve
• purposefulness
• resoluteness

Antonyms & Near Antonyms

• uncertainty
• doubt
• hesitation
• hesitancy
• irresolution
• concern
• disbelief
• incertitude
• indecisiveness
• incredulity
• anxiety
• unbelief
• nonconfidence
• suspicion
• distrust
• misgiving
• mistrust

2

as in likelihood

the quality or state of being impossible to avoid or evade

the proverbial certainty of death and taxes

Synonyms & Similar Words

• likelihood
• inevitability
• probability
• inevitableness
• ineluctability
• inexorability
• relentlessness
• inexorableness

Antonyms & Near Antonyms

• uncertainty
• improbability
• unlikelihood
• preventability
• doubtfulness
• unlikeliness
• dubiousness

Synonym Chooser

How does the noun certainty differ from other similar words?

The words certitude and conviction are common synonyms of certainty. While all three words mean "a state of being free from doubt," certainty and certitude are very close; certainty may stress the existence of objective proof.

claims that cannot be confirmed with scientific certainty

When might certitude be a better fit than certainty?

The synonyms certitude and certainty are sometimes interchangeable, but certitude may emphasize a faith in something not needing or not capable of proof.

believes with certitude in an afterlife

When is conviction a more appropriate choice than certainty?

In some situations, the words conviction and certainty are roughly equivalent. However, conviction applies especially to belief strongly held by an individual.

holds firm convictions on every issue

Example Sentences

Recent Examples of certainty

And while some may say academics exist in an ivory tower, the experience of welcoming generations of young people into our institutions each year provides a constant reminder of what is gained by educating young adults to ask why and why not rather than to rely on rote certainty. —Brendan Harley, Twin Cities, 11 Sep. 2025

Although the program wasn’t set to expire until 2030, proponents of reauthorization argued that buyers of these credits — industry polluters — needed certainty that the program would continue to exist to keep bringing in revenues needed to fund the state’s transition to clean energy. —Calmatters, Oc Register, 11 Sep. 2025

Through all the chaos, though, Sallie Carol endows her daughter with the most valuable of inheritances: the certainty of being fiercely loved. —Rebecca Mead, New Yorker, 3 Sep. 2025

And the 25-second espresso shot is a tradition … not a scientific certainty. —Matthew Korfhage, Wired News, 2 Sep. 2025