Definition for certain

adjective as in confident

adjective as in fixed

adjective as in referring to a specifically known amount

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Example Sentences

There are certain people you meet, and right away you can tell they have a good heart.

To that end, NBCU will effectively tailor the measurement program to take into account non-advertising factors specific to certain types of advertisers.

From Digiday

James Robinson, who has spent decades researching why certain states and societies prosper, he’s come to a more nuanced understanding.

Initially, the task force focused almost entirely on trying to keep the virus out of the country, rather than preparing for an all-but-certain outbreak in the United States, these people said.

It was an isolated examination of a certain time period, one that we’re now past.

Certain features of its history suggest why this may be the case.

Unlike the Soviet Union at a certain period in history, the Russian economy does not hold a candle to that of the United States.

I believe in the power of institutions—Congress, public policy, certain ideas about politics—that last for a long time.

At least for now, because few things about this dispute are absolutely certain.

And a certain presumed presidential candidate needs to be doing it, too.

On certain of the stems the fertile cone appears and the spores are ripened about June, after which the process withers.

The possibilities of certain branches of teaching have been altogether revolutionized by the cinematograph.

M'Bongo and his whole court are now clothed, I am happy to say, at least to a certain extent.

After a bit of waiting, Mac decided that the smoke was floating from a certain direction, and we began to edge carefully that way.

He has secured the release of certain Spanish prisoners, and is building two ships.


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When To Use

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. 

On this page you'll find 248 synonyms, antonyms, and words related to certain, such as: convinced, positive, sure, assertive, assured, and believing.

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.