Synonyms for

Certain

Verb / ˈsɜ:tʌn / Another word for certain — explore alternatives below. For syllable breakdowns and pronunciation, see this word on Syllablesworld.

Definition

Something that is sure or known to be true.

Synonyms & similar words

uncertain sealed sure unsealed unsure sure confident definite assured positive clear indisputable irrefutable undeniable unquestionable established fixed guaranteed unchanging unvarying consistent reliable trustworthy credible conclusive

Synonyms by register

Formal

definite assured convinced positive sure

Informal

sure positive got it no doubt

Literary

infallible unerring steadfast

Antonyms

uncertain doubtful unsure ambiguous vague unclear questionable

Common collocations

  • certainly true
  • certainly not
  • certain amount
  • certain degree
  • certain extent
  • certain point
  • certainly seems
  • certainly the case

Word family

noun certainty
adverb certainly

Usage note

When used to mean 'sure', 'certain' is often followed by 'that' or an infinitive. 'Certain' can also mean 'some' or 'a particular', as in 'a certain person'.

Example sentences

  1. I am certain that it is going to rain today.
  2. She was certain that she had seen a ghost in the old house.
  3. He was certain that he had the right answer to the math problem.
  4. I am certain that he will be back soon.
  5. She was certain that the book was on the shelf.

Quotes

  • To be certain of God means that we are uncertain in all our ways, we do not know what a day may bring forth. This is generally said with a sigh of sadness; it should rather be an expression of breathless expectation. We are uncertain of the next step, but we are certain of God. Oswald Chambers
  • I am certain of nothing but the holiness of the heart's affections, and the truth of imagination. John Keats
  • If you're certain of what you're doing, you don't need to do much else. Brandi Chastain

Try these popular words

the and that for you with was this are have not from

Practice

Play the Word Synonyms game · Choose level (start near 1)

Worksheets

Grade 4 · Grade 5 · Grade 6

Topics

Guides

Explore more words