Definition of uncertain adjective from the Oxford Advanced Learner's Dictionary

      

    uncertain

     adjective
    adjective
    BrE BrE//ʌnˈsɜːtn//
     
    ; NAmE NAmE//ʌnˈsɜːrtn//
     
     
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  1. 1  [not before noun] uncertain (about/of something) feeling doubt about something; not sure They're both uncertain about what to do. I'm still uncertain of my feelings for him. opposite certain Express YourselfExpressing certainty or uncertaintyWhen you are stating what has happened or is going to happen, you can say how certain or uncertain you are about what you are saying: I'm sure/100% certain/​absolutely positive I left my keys on the table. There's no doubt in my mind that this is the best option. Without a doubt,/No question, this is where it was. I'm not (at all) sure what time they arrive, to be honest. I rather doubt they'll call back.(British English)
  2. 2  likely to change, especially in a negative or unpleasant way Our future looks uncertain. a man of uncertain temper
  3. 3  not definite or decided synonym unclear It is uncertain what his role in the company will be.
  4. 4not confident synonym hesitant The baby took its first uncertain steps.
  5. Extra examples Cost estimates are notoriously uncertain in this business. He seemed strangely uncertain as to how to continue. His research into the incident has left him uncertain as to exactly where responsibility lay. I feel deeply uncertain about the future. The world is inherently uncertain. We were rather uncertain of the direction it came from. Whether diet is an important factor in this illness is still uncertain. immigration policies that made employment status uncertain He was a man of uncertain temper. I’m still uncertain of my feelings for him. She had been dismissed and in no uncertain manner. They’re both uncertain about what to do.Idioms clearly and strongly I told him what I thought of him in no uncertain terms.
See the Oxford Advanced American Dictionary entry: uncertain

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