Synonyms & Antonyms of certainty

1 a state of mind in which one is free from doubt
  • I have full certainty that I'll pass the test

Synonyms for certainty

Words Related to certainty

Near Antonyms for certainty

Antonyms for certainty

2 the quality or state of being impossible to avoid or evade
  • the proverbial certainty of death and taxes

Synonyms for certainty

Words Related to certainty

Near Antonyms for certainty

Antonyms for certainty

See the Dictionary Definition 

Frequently Asked Questions About certainty

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

Keep scrolling for more

Learn More about certainty

Time Traveler for certainty

Time Traveler

The first known use of certainty was in the 14th century

See more words from the same century

Statistics for certainty

Last Updated

28 May 2020

Cite this Entry

“Certainty.” Thesaurus, Merriam-Webster, Accessed 2 Jul. 2020.

Keep scrolling for more

More from Merriam-Webster on certainty

Dictionary: Definition of certainty

Spanish Central: Translation of certainty

Nglish: Translation of certainty for Spanish Speakers

Britannica English: Translation of certainty for Arabic Speakers Encyclopedia article about certainty

Comments on certainty

What made you want to look up certainty? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!