Sorry, no online dictionaries contain the exact phrase hard and fast rule.
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Reverse dictionary results:
1. absolute
 2. unwavering
3. rigid
4. strict
5. unchanging
6. incumbently
7. intent
8. rarity
9. simon-pure
10. alone
 11. freeness
12. impartially
13. lone
14. only
15. overt
16. peerlessly
17. public domain
18. pure
19. solitary
20. candor
 21. everliving
22. fair-minded
23. free-spoken
24. ideal
25. middlingly
26. omnipotently
27. openness
28. simple
29. single
30. sizeably
 31. unevasive
32. discretionally
33. elusive
34. freedom
35. immediacy
36. impeccably
37. incessantness
38. inconclusiveness

You can look up the words in the phrase individually using these links:   hard ?   and ?   fast ?   rule ?
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