certain
Usage
What are other ways to say certain?
Certain, one of a handful of adjectives indicating full belief and trust that something is true, suggests that there are definite reasons that have freed one from doubt. Confident emphasizes the strength of the belief or the certainty of expectation felt. Positive implies emphatic certainty, which may even become overconfidence or dogmatism. Sure, the simplest and most general term, expresses mere absence of doubt.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The company said it launched an investigation with support from external cybersecurity experts and took certain internal IT systems offline as a precaution.
From The Wall Street Journal • Jun. 11, 2026
And it is based on a type of attempted economic revolution in the pricing mechanism that clearly does value a certain type of fan more - those on the diagonally upwards line of that graph.
From BBC • Jun. 11, 2026
Because private shares are highly illiquid, these investments are bound by lockup agreements, meaning that investors are prohibited from redeeming or withdrawing their capital for a certain period.
From MarketWatch • Jun. 11, 2026
Scientists caution that every El Nino is different and strong events like that forecast this year do not guarantee certain impacts -- but tilt the odds in their favour.
From Barron's • Jun. 11, 2026
I’m almost certain I made mistakes, but given everything that’s going on, I think I did pretty well.
From "Split the Sky" by Marie Arnold
Vocabulary lists containing certain
The Real Deal: Synonyms for "True"
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List 1
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A Sure Thing: Synonyms for "Definite"
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