Sorry, no online dictionaries contain the exact phrase most rigorous.
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Reverse dictionary results:
1. stringent
 2. strict
3. severe
4. tough
5. district
6. hard-and-fast
7. rigorous
8. astrictive
9. intense
10. intensive
 11. regimental
12. straitly
13. straught
14. strickly
15. taut
16. tight-laced
17. uptight
18. weightily
19. astringently
20. chronically
 21. clingingly
22. desperate
23. heavily
24. intence
25. intensely
26. overrigorous
27. rigoristic
28. rigorously
29. severely
30. str
 31. strictly
32. stringently
33. strong
34. swith
35. tightly
36. bindingly
37. budge

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