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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31. Poor organization was certainly a contributory factor to the crisis.
32. I can certainly assure you I'm looking after number one all right.
33. It was certainly useful to have her there to chauffeur him around.
34. We've certainly got our share of problems at the moment.
35. I certainly don't have anything to prove-my record speaks for itself.
36. I can't say for definite who did it, but I certainly have my suspicions .
37. A month of holidays in the summer resort will certainly bring you around.
38. Frequent cultural exchange will certainly help foster friendly relations between our two universities.
39. You have to believe,you must believe tomorrow will certainly come.
40. Certainly, the early learning years are crucial to a child's educational development.
41. It is certainly worth checking up on your benefit entitlements.
42. The purists won't like it,(sentencedict.com) but opera on TV certainly brings in the audiences.
43. He certainly pricked up his ears when you told him about your good luck.
44. I'm quite tired but I can certainly walk a little further.
45. It would certainly be within his power to authorize a police raid like that.
46. The French contingent certainly made their presence known at this year's conference.
47. I shall certainly be present at the meeting, but I am not sure about my wife.
48. The bombs are almost certainly part of a much bigger conspiracy.
49. The news is almost certainly true although it is not official.
50. Certainly. Where to, sir?
51. Although he's shy, it certainly hasn't impeded his career in any way.
52. The facts certainly fit your theory.
53. one who must certainly be invited.
54. The boss will certainly be jolly angry.
55. The new chairman is certainly making his presence felt!
56. She certainly knows how to get results .
57. Angela's divorce will certainly set tongues wagging.
58. This shirt has certainly seen some service.
59. The title race is certainly hotting up.
60. He certainly bears you no malice .
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.