Sorry, no online dictionaries contain the exact phrase period of dullness.
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Reverse dictionary results:
1. longueur
 2. boredom
3. slack
4. slacking
5. slacks
6. depression
7. luster
8. stagnation
9. bluntness
10. deadness
 11. tediousness
12. tedium
13. tiresomeness
14. dismal
15. seasoning
16. tedious
17. bore
18. clear
19. deadly
20. density
 21. drab
22. gape
23. gaping
24. haze
25. languor
26. muddle
27. muddled
28. platitude
29. tarnish
30. tire
 31. tiring
32. vegetate
33. vegetated
34. dim
35. mouldy
36. obtuse
37. rote
38. rusty
39. stagnant
40. anus

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You can look up the words in the phrase individually using these links:   period ?   of ?   dullness ?
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