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

 

ominous

 adjective
adjective
BrE BrE//ˈɒmɪnəs//
 
; NAmE NAmE//ˈɑːmɪnəs//
 
 
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suggesting that something bad is going to happen in the future synonym foreboding There were ominous dark clouds gathering overhead. She picked up the phone but there was an ominous silence at the other end. Things looked ominous for Susan. Word Origin late 16th cent.: from Latin ominosus, from omen, omin- ‘omen’.
See the Oxford Advanced American Dictionary entry: ominous