Sorry, no online dictionaries contain the exact phrase be rigorous.
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Reverse dictionary results:
1. drastic
 2. exact
3. hard
4. harsh
5. severe
6. stern
7. strict
8. stringent
9. ascetic
10. ascetical
 11. austere
12. close
13. draconian
14. exacting
15. inquisitor
16. ironclad
17. lax
18. lenient
19. logic
20. rhadamanthine
 21. rigid
22. rigor
23. rigorously
24. rigorousness
25. scrupulous
26. spartan
27. strait
28. stricter
29. strictly
30. stringency
 31. struct
32. thorough
33. tough
34. abrasive
35. acid test
36. angry
37. ascesis
38. asceticism
39. austerity
40. blue

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