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

One of the few certainties is that Xabi Alonso was never likely to be part of what happened next. —Oliver Kay, New York Times, 31 May 2026

Unlike Indiana’s package, the Illinois bill would not fund stadium construction directly but would aim to give the Bears the financial certainty team officials said was essential to move forward at Arlington Park. —Jeremy Gorner, Chicago Tribune, 30 May 2026

While Duran Ferree and CJ dos Santos both have arguments for minutes, the back line would benefit from rhythm and certainty. —Eddie Brown, San Diego Union-Tribune, 29 May 2026

Ike, we’re told, likes certainty. —Bilge Ebiri, Vulture, 29 May 2026