Sorry, no online dictionaries contain the exact phrase lacking seriousness.
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Reverse dictionary results:
1. frivolous
2. flippant
3. superficial
4. light-hearted
5. unserious
6. idleness
7. carefreeness
8. pusillanimity
9. absurdism
10. amateurishness
11. flippancy
12. ludicrousness
13. moronically
14. obstinate
15. sinfully
16. threap
17. triflingness
18. triviality
19. uncanny
20. wrongheadedness
21. barbarity
22. blase
23. callowly
24. contumaciousness
25. facetiousness
26. faintheartedness
27. foolishly
28. funny
29. gormlessness
30. humorousness
31. insanity
32. light
33. light-mindedness
34. lightmindedly
35. low-mindedness
36. naughtily
37. nervelessness
38. obstinateness
39. odd bod

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You can look up the words in the phrase individually using these links:   lacking ?   seriousness ?
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