Antonym: doubt, mistrust, uncertainty. Similar words: uncertainty, uncertainty principle, certain, for certain, ascertain, uncertain, certainly, certainly not. Meaning: ['sɜːtntɪ] 
n. 1. the state of being certain 2. something that is certain.
n. 1. the state of being certain 2. something that is certain. 
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1, She knew with absolute certainty that he'd say no.
2, Their suspicions hardened into certainty.
3, Her return to the team now seems a certainty.
4, 'You're wrong,' she said with absolute certainty.
5, It's a dead certainty that this horse will win the race.
6, As we start the new millennium the only certainty is change, and lots of it.
7, I have told them with absolute certainty there'll be no change of policy.
8, It's a virtual certainty that petrol will go up in price.
9, It's a certainty that our team will win the game this time.
10, It is not possible to predict with any certainty what effect this will have.
11, This is a virtual certainty.
12, A general election became a certainty three weeks ago.
13, There's no certainty that he'll remember.
14, England will lose the match that's a certainty!
15, They're a practical certainty to win the game.
16, We can have no certainty of success.
17, I couldn't say with absolute certainty that he's here.
18, I'm unable to answer that question with any certainty.
19, Joan will win - that's a certainty.
20, We don't know with absolute certainty that the project will succeed.
21, I know for a certainty that the company has been bought up.
22, It's difficult to predict with any degree of certainty how much it will cost.
23, I can't say with any certainty where I'll be next week.
24, The only certainty is that there will need to be major changes.
25, The one certainty left in a changing world is death.
26, Sampras looks a practical certainty to win Wimbledon this year.
27, There is too little certainty about the present state of the German economy.
28, In this world, there is no accident,[http://sentencedict.com/certainty.html] but some certainty that pretends to be accident.
29, War in the region now looks like a virtual certainty.
30, The book fails to answer the question with any acceptable degree of certainty.
More similar words: uncertainty, uncertainty principle, certain, for certain, ascertain, uncertain, certainly, certainly not, pertain, appertain, entertain, entertained, entertaining, entertainment, curtain, dainty, maintain, iron curtain, suzerainty, taint, tainted, untainted, curtail, pointy, flinty, curtailment, overtake, stain, water tank, undertake.