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English definition of “ominous”

ominous

adjective  /ˈɑm·ə·nəs/ us  
suggesting something unpleasant will happen: a ominous silence
ominously
adverb  /ˈɑm·ə·nə·sli/ us  
Clouds had gathered ominously.
(Definition of ominous from the Cambridge Academic Content Dictionary © Cambridge University Press)
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