Sorry, no online dictionaries contain the exact phrase to be ominous.
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Reverse dictionary results:
1. bad
 2. baleful
3. dire
4. fateful
5. grave
6. grim
7. sinister
8. ugly
9. abode
10. bode
 11. boding
12. direful
13. evil
14. fatal
15. thundery
16. forbidding
17. foreboding
18. knell
19. ominously
20. portentous
 21. portentously
22. augur
23. augural
24. bodeful
25. brew
26. darken
27. doomful
28. else
29. foreholding
30. hellhound
 31. hissing
32. ides
33. lower
34. miasma
35. noose
36. osse
37. pall
38. panomphean
39. portent
40. potent

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