Sorry, no online dictionaries contain the exact phrase really bad idea.
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Reverse dictionary results:
1. nil
 2. good
3. ghastly
4. stupid
5. evil
6. nasty
7. severe
8. agony
9. nonstarter
10. grave
 11. hard
12. hurt
13. hurting
14. ill
15. mal
16. null
17. poor
18. poorly
19. serious
20. stink
 21. wicked
22. worse
23. wrong
24. zero
25. crave
26. total
27. error
28. beast
29. sage
30. turkey
 31. abysmal
32. awful
33. dire
34. horrible
35. horrid
36. lousy
37. terrible
38. appalling
39. badly
40. bite

More reverse dictionary results >>

You can look up the words in the phrase individually using these links:   really ?   bad ?   idea ?
(A question mark next to a word above means that we couldn't find it, but clicking the word might provide spelling suggestions.)

Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
real*to search for words beginning with real, or
*ideato search for words ending with idea
You might also try these searches: Google, News, Images, Wikipedia, Reddit, BlueSky



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