Ominously in spanish

Ominamente

pronunciation: oʊminɑmente part of speech: adverb
In gestures

ominously = siniestramente, ominosamente, amenazadoramente. 

Example: The press spokesman 'ominously warned' Americans to 'watch what they say,' which amounted to telling citizens 'to accept the administration's version of events, not ask awkward questions'.
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