Sorry, no online dictionaries contain the exact phrase most serious.
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Reverse dictionary results:
1. severe
 2. critical
3. grave
4. dire
5. paramount
6. solemnly
7. bodeful
8. bodingly
9. draconian
10. procrustean
 11. regimental
12. retentive
13. rigour
14. uptight
15. delicately
16. exacting
17. fairly
18. hard-and-fast
19. martinet
20. ponderous
 21. ponderously
22. punctiliously
23. refined
24. rigorous
25. sober
26. studiously
27. bearably
28. diligently
29. extreme
30. fastidiously
 31. gravamen
32. heavy-handed
33. heavyhanded
34. pensive
35. prohibitively
36. rigorism
37. rigoristic
38. rigorously

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