Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: ominosus, from omen

ominous

 adjective
     
om‧i‧nous
making you feel that something bad is going to happen:
'How long will she be ill?' he asked. There was an ominous silence.
The car is making an ominous rattling sound.
—ominously adverb:
The sky looked ominously dark.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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