Sorry, no online dictionaries contain the exact phrase nightmarish and powerful.
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Reverse dictionary results:
1. creep
2. dream
3. eerie
4. elm
5. freak
6. ogre
7. scary
8. worst
9. face
10. fierce
11. monster
12. terrible
13. acute
14. alarmed
15. alarming
16. antephialtic
17. bloodcurdling
18. blue
19. boo
20. calamitous
21. childish
22. chiller
23. creeps
24. deplorable
25. depressant
26. dire
27. disgraceful
28. dismal
29. disturbing
30. dread
31. fearful
32. flay
33. flaying
34. formidable
35. freaking
36. frightening
37. frightful
38. gallows humor
39. grievous
40. grim

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You can look up the words in the phrase individually using these links:   nightmarish ?   and ?   powerful ?
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