Sorry, no online dictionaries contain the exact phrase rigorous solution.
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Reverse dictionary results:
1. hard
2. abrasive
3. ascetic
4. austere
5. austerity
6. blue
7. close
8. critic
9. drastic
10. drill
11. formality
12. inexact
13. nice
14. relax
15. rhadamanthine
16. rigor
17. rigorously
18. season
19. seasoned
20. severe
21. stern
22. strait
23. strict
24. strictly
25. stringency
26. stringent
27. struct
28. quarantined
29. aliquot
30. alloy
31. alloyed
32. base
33. bath
34. bittern
35. brainstorming
36. break
37. break up
38. breakup
39. brine
40. chelation

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