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certain

See definition of certain on Dictionary.com
  • adj.confident
  • adj.undoubtable, valid
  • adj.fixed
  • adj.referring to a specifically known amount

synonyms for certain

  • convinced
  • positive
  • sure
  • assertive
  • assured
  • believing
  • calm
  • cocksure
  • questionless
  • sanguine
  • satisfied
  • secure
  • self-confident
  • unconcerned
  • undisturbed
  • undoubtful
  • undoubting
  • unperturbed
  • untroubled

antonyms for certain

MOST RELEVANT
  • doubtful
  • uncertain
  • unsure
  • doubting
  • dubious
  • faltering
  • hesitant
  • unconfident
  • undecided
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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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. 

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How to use certain in a sentence

There are certain people you meet, and right away you can tell they have a good heart.
A WELCOME LIFELINEWASHINGTON REGIONAL TRANSPLANT COMMUNITYSEPTEMBER 17, 2020WASHINGTON BLADE
To that end, NBCU will effectively tailor the measurement program to take into account non-advertising factors specific to certain types of advertisers.
NBCUNIVERSAL TESTS NEW MEASUREMENT PROGRAM TO PROVE IT CAN PUSH PRODUCT SALES FOR ADVERTISERSTIM PETERSONSEPTEMBER 17, 2020DIGIDAY
James Robinson, who has spent decades researching why certain states and societies prosper, he’s come to a more nuanced understanding.
DOES ANYONE REALLY KNOW WHAT SOCIALISM IS? (EP. 408 REBROADCAST)STEPHEN J. DUBNERSEPTEMBER 17, 2020FREAKONOMICS
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.
TEN DAYS: AFTER AN EARLY CORONAVIRUS WARNING, TRUMP IS DISTRACTED AS HE DOWNPLAYS THREATASHLEY PARKER, JOSH DAWSEY, YASMEEN ABUTALEBSEPTEMBER 17, 2020WASHINGTON POST
It was an isolated examination of a certain time period, one that we’re now past.
THE PROBLEM WITH TRUMP’S ‘HERD MENTALITY’ LINE ISN’T THE VERBAL FLUB. IT’S THE MASS DEATH.PHILIP BUMPSEPTEMBER 16, 2020WASHINGTON POST
Voters in Wisconsin are closely following the election, and 9 in 10 say they are certain to vote in November.
POST-ABC WISCONSIN POLL SHOWS BIDEN HOLDING NARROW EDGE OVER TRUMPDAN BALZ, EMILY GUSKINSEPTEMBER 16, 2020WASHINGTON POST
As companies increasingly adopt machine learning, they’ll need fewer full-time employees for certain tasks, resulting in more part-time jobs or temporary work—all without health and retirement benefits.
WHEN IT COMES TO A.I., WORRY ABOUT ‘JOB CHURN’ INSTEAD OF ‘JOB LOSS’JONATHANVANIAN2015SEPTEMBER 15, 2020FORTUNE
Sometimes the biggest reason the stock market or certain stocks experience a severe decline in price is because they first experienced a massive rise in price.
WHY EVEN THE BEST STOCKS HAVE TO CRASHBEN CARLSONSEPTEMBER 13, 2020FORTUNE
Even worse, the “keepers” would have to shoulder the work of those let go, which seemed certain to lead to bitterness.
WHAT IF YOUR COMPANY HAD NO RULES? (BONUS EPISODE)MARIA KONNIKOVASEPTEMBER 12, 2020FREAKONOMICS
On certain of the stems the fertile cone appears and the spores are ripened about June, after which the process withers.
HOW TO KNOW THE FERNSS. LEONARD BASTIN
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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.