Ominous

прилагательное 1) предсказывающий, предвещающий 2) грозный, зловещий, угрожающий Синоним(ы): sinister, ill-boding

Большой англо-русский словарь

Ominous

adjective being or exhibiting an omen; portentous; especially foreboding or foreshadowing evil; inauspiciousominously adverbominousness noun Synonyms: ominous, portentous, fateful mean having a menacing or threatening aspect. ominous implies having a menacing, alarming character foreshadowing evil or disaster Example: ominous rumblings from the volcano. portentous suggests being frighteningly big or impressive but now seldom definitely connotes forewarning of calamity Example: an eerie and portentous stillness. fateful suggests being of momentous or decisive importance Example: the fateful conference that led to war.

Merriam-Webster's Collegiate Dictionary