Synonyms of ominous in English:

ominous


See definition of ominous

adjective

1‘ominous black clouds gathered on the horizon’

SYNONYMS
threatening, menacing, baleful, forbidding, sinister, doomy, inauspicious, unpropitious, portentous, unfavourable, dire, unpromising
black, dark, wintry, gloomy, ugly
archaic direful
rare minatory, minacious, sinistrous
ANTONYMS

promising, auspicious, propitious