Sorry, no online dictionaries contain the exact phrase opposite of lighthearted.
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Reverse dictionary results:
1. serious
2. solemn
3. grave
4. heavy
5. somber
6. serena
7. sombre
8. dour
9. somberly
10. buskined
11. gravamen
12. hurry sickness
13. languidness
14. languishment
15. languor
16. lassitude
17. solitary
18. sullen
19. anancastic
20. ardency
21. benightedly
22. direness
23. doggedness
24. drearily
25. dull
26. dullness
27. laboriousness
28. languid
29. languorousness
30. leadenness
31. lithesomeness
32. melancholia
33. melancholy
34. rigidity
35. sad
36. snugness
37. sombrely

You can look up the words in the phrase individually using these links:   opposite ?   of ?   lighthearted ?
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