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

Signing Edvinsson to a short-term bridge, for example, could easily disrupt an incoming GM’s cost certainty and miss an opportunity to secure a key piece of the Red Wings’ future. — Max Bultman, New York Times, 30 July 2026

Prediction markets had a higher level of certainty that the Fed would hold. — Jeff Cox, CNBC, 29 July 2026

Organizations that wait for certainty before acting will likely discover that certainty never arrives. — Michael Edmondson, Forbes.com, 28 July 2026

Businesses cannot wait for perfect conditions before investing, and policymakers cannot expect private capital to flow at the pace required without providing greater certainty. — Andreas Schierenbeck, Fortune, 27 July 2026