Sorry, no online dictionaries contain the exact phrase insanely fast.
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Reverse dictionary results:
1. blistering
2. lightning-fast
3. breakneck
4. supersonic
5. warp speed
6. soaringly
7. ebb and flow
8. aslope
9. bluff
10. ithe
11. slope
12. steep
13. undertide
14. uplighting
15. upsweep
16. versant
17. acclivity
18. cant
19. devex
20. hade
21. precipice
22. precipitous
23. rake
24. raked
25. raking
26. rapid
27. sheer
28. shelving
29. sloped
30. sloping
31. slopy
32. swift
33. acclivous
34. clivity
35. downhill
36. downsloping
37. grade
38. gradient
39. outpocketing

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You can look up the words in the phrase individually using these links:   insanely ?   fast ?
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