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

The result had become a near-certainty since the fall, when the junior guided Indiana through its first undefeated season, winning the Heisman after passing for 3,535 yards and 41 touchdowns along with seven scores on the ground. —Noah White, Miami Herald, 24 Apr. 2026

In fact, in the hours leading up to the draft, the only certainty was uncertainty. —Elliott Teaford, Oc Register, 22 Apr. 2026

Buckner said colleagues wanted assurances that taxpayers would not be left exposed and that the legislation would offer something to ordinary residents, not just tax certainty for eligible businesses. —Jeremy Gorner, Chicago Tribune, 21 Apr. 2026

These two substances collectively constitute 95% of the universe yet have never been detected with certainty. —Monisha Ravisetti, Space.com, 21 Apr. 2026