Definition of ominously adverb from the Oxford Advanced Learner's Dictionary

 

ominously

 adverb
adverb
BrE BrE//ˈɒmɪnəsli//
 
; NAmE NAmE//ˈɑːmɪnəsli//
 
 
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in a way that suggests that something bad is going to happen in the future Thunder rumbled ominously overhead. The streets were ominously quiet.