Definition of unlikely adjective from the Oxford Advanced American Dictionary

      

    unlikely

     adjective
    adjective
    NAmE//ʌnˈlaɪkli//
     
    (unlikelier, unlikeliest)more unlikely and most unlikely are the usual forms
     
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  1. 1 not likely to happen unlikely (to do something) The project seemed unlikely to succeed. unlikely (that…) It's most (= very) unlikely that she'll arrive before seven. In the unlikely event of a problem arising, please contact the hotel manager.
  2. 2[only before noun] not the person, thing, or place that you would normally think of or expect He seems a most unlikely candidate for the job. They have built hotels in the most unlikely places.
  3. 3[only before noun] difficult to believe synonym implausible She gave me an unlikely explanation for her behavior. opposite likely
unlikelihood
 
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NAmE//ʌnˈlaɪkliˌhʊd//
 
(also unlikeliness
 
)
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: unlikely