21 ominous synonyms include threatening, menacing, baleful, forbidding, sinister, doomy, inauspicious, unpropitious, portentous, and unfavourable. Ominous is an adjective, and its antonyms are promising, auspicious, and propitious. Here are some additional synonyms for "ominous" with example sentences.
21 other ways to say ominous.
He had an ominous feeling about it.
The sky looked ominous before the storm.