Antonym: perhaps. Similar words: certainly not, certain, uncertain, for certain, uncertainty, entertainment, mainly, ungainly. Meaning: ['sɜːtnlɪ] 
adv. definitely or positively (`sure' is sometimes used informally for `surely').
adv. definitely or positively (`sure' is sometimes used informally for `surely'). 
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1. The design certainly looks good on paper.
2. Macmillan wrote back saying that he could certainly help.
3. A generation ago genetic codes were certainly unknown.
4. Georgia certainly didn't seem to be a fool.
5. There certainly wasn't any malice in her comments.
6. She certainly hasn't been pining while you were away!
7. An invasion would certainly precipitate a political crisis.
8. Music can certainly enrich your whole life.
9. He certainly was not politically inactive.
10. The timely rain will certainly bring on the crops.
11. Without treatment, she will almost certainly die.
12. He certainly is a marvellous actor.
13. The company certainly has the potential for growth.
14. The story is almost certainly false.
15. He certainly didn't seem to be a fool.
16. She was certainly no paragon of virtue!
17. Paul's certainly mellowed over the years.
18. The timing of the meeting is certainly fortuitous.
19. They will certainly report back to their government.
20. I certainly don't begrudge him the Nobel Prize.
21. I certainly did not like the place.
22. Wow ! That car certainly goes fast ! !
23. I certainly never expected to become a writer.
24. I'm certainly not scared of him.
25. I'm certainly never going there again.
26. She certainly bears you no malice.
27. "Can you help me?" "Certainly".
28. I'll certainly carry on living here for the foreseeable future.
29. I can certainly feel the effects of too many late nights.
30. Everything goes amiss with him[sentencedict.com], he has certainly bad luck.
More similar words: certainly not, certain, uncertain, for certain, uncertainty, entertainment, mainly, ungainly, curtain, maintain, concert, undertake, obtain, retain, sustain, captain, contain, container, retaining, sustainable, in line, only, openly, if only, only too, fall in love, in line with, commonly, only that, cancer.