Synonym: changeable, doubtful, insecure, precarious, speculative, unpredictable, unsure. Antonym: certain. Similar words: uncertainty, certain, for certain, certainly, certainly not, entertainment, curtain, concert. Meaning: [ʌnˈsɜːt(ə)n; -tɪn] 
adj. 1. lacking or indicating lack of confidence or assurance 2. not established beyond doubt; still undecided or unknown 3. not established or confirmed 4. not certain to occur; not inevitable 5. subject to change 6. not consistent or dependable 7. ambiguous (especially in the negative).
adj. 1. lacking or indicating lack of confidence or assurance 2. not established beyond doubt; still undecided or unknown 3. not established or confirmed 4. not certain to occur; not inevitable 5. subject to change 6. not consistent or dependable 7. ambiguous (especially in the negative). 
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31. The political outlook is still uncertain.
32. The date of his departure is uncertain.
33. I am uncertain what to do.
34. The future by its very nature is uncertain.
35. It's uncertain whether they will accept the plan.
36. The team's continued involvement in the competition is uncertain.
37. I was uncertain about what to do next.
38. Cost estimates are notoriously uncertain in this business.
39. The prognosis for the economy is uncertain.
40. Ruth hesitated, uncertain of how to combine honesty and diplomacy in her answer.
41. For once I felt uncertain about blurting out my real feelings. I decided to play it cool.
42. Journalists were told, in no uncertain terms , that they were not welcome.
43. Whether diet is an important factor in this illness is still uncertain.
44. Whether the project will be a commercial success is still uncertain.
45. Our future looks uncertain.
46. With some hesitation and an uncertain smile,(sentencedict.com) she held out her hand.
47. Frank was very uncertain as to whether it was the right job for him.
48. Torn apart by war, its economy virtually destroyed, this country now faces a very uncertain future.
49. She told him in no uncertain terms to go away.
50. He told her in no uncertain manner that her behaviour was unacceptable.
51. Karpov struck back in no uncertain fashion to win the seventh game.
52. For once I felt uncertain about my real feelings. I decided to play it cool.
53. It is uncertain what his role in the company will be.
54. If you are uncertain about your physical condition, check with your doctor before trying these exercises.
55. I told him in no uncertain terms what I thought of his behaviour.
56. We didn't have the picnic because the weather was uncertain.
56. Sentencedict.com try its best to gather and create good sentences.
57. Phoebe was hovering in the background, uncertain what to do.
58. His aim is uncertain.
59. We let them know in no uncertain terms just how disappointed we were.
60. The author seems uncertain whether he is writing a comedy or a tragedy, so the play falls between two stools.
More similar words: uncertainty, certain, for certain, certainly, certainly not, entertainment, curtain, concert, maintain, undertake, uncomfortable, cancer, obtain, retain, dancer, sustain, contain, captain, concern, bounce, container, retaining, announce, sustainable, concerning, of importance, announcement, maintenance, officer, soccer.