Read the dictionary definition of ominous. All definitions for this word.
1. presaging ill fortune
1. ill omens
2. ill predictions
3. my words with inauspicious thunderings shook heaven
4. a dead and ominous silence prevailed
5. a by-election at a time highly unpropitious for the Government
2. threatening or foreshadowing evil or tragic developments
1. a baleful look
2. forbidding thunderclouds
3. his tone became menacing
4. ominous rumblings of discontent
5. sinister storm clouds
6. a sinister smile
7. his threatening behavior
8. ugly black clouds
9. the situation became ugly