Adjective
1. threatening or foreshadowing evil or tragic developments;
"a baleful look""forbidding thunderclouds""his tone became menacing""ominous rumblings of discontent""sinister storm clouds""a sinister smile""his threatening behavior""ugly black clouds""the situation became ugly"2. presaging ill-fortune;
"ill omens""ill predictions""my words with inauspicious thunderings shook heaven"- P.B.Shelley"a dead and ominous silence prevailed""a by-election at a time highly unpropitious for the Government"