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ominous

om·i·nous

ominous

 
pronunciation:
a m ns
part of speech: adjective
definition: giving a sign of future evil or trouble.
The black clouds looked ominous, so we decided to go to the lake some other day.
synonyms:
sinister, threatening
antonyms:
promising
similar words:
dark, grim, menacing, ugly
derivations: ominously (adv.), ominousness (n.)