Definition of ominous adjective from the Oxford Advanced American Dictionary

     

    ominous

     adjective
    adjective
    NAmE//ˈɑmənəs//
     
     
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  1. 1suggesting that something bad is going to happen in the future synonym foreboding
  2. 2 There were ominous dark clouds gathering overhead. She picked up the phone but there was an ominous silence at the other end.
 
adverb
See the Oxford Advanced Learner's Dictionary entry: ominous