Sorry, no online dictionaries contain the exact phrase you cannot be serious!.
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Reverse dictionary results:
1. canna
 2. abhor
3. acatalepsy
4. ace
5. aeropause
6. ageless
7. agnostic
8. alie
9. ambiguity
10. analphabet
 11. analysis paralysis
12. anaphora
13. anu
14. any
15. apophatism
16. aprotic
17. argue
18. arse
19. athetosis
20. avidin
 21. background noise
22. bad block
23. bar
24. barn door
25. bedpan
26. being
27. blackhole
28. blind bend
29. blind corner
30. blind curve
 31. blind spot
32. bound
33. break seal
34. bridge
35. bridged
36. bridging
37. bubble
38. bucket shop
39. butterfingers
40. carney

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You can look up the words in the phrase individually using these links:   you ?   cannot ?   be ?   serious! ?
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