Sorry, no online dictionaries contain the exact phrase opposite of frivolous.
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Reverse dictionary results:
1. impertinent
2. solid
3. dally
4. free
5. staid
6. cavil
7. idle
8. cavillation
9. antipodal
10. antipodes
11. back
12. cast
13. casted
14. deep
15. dissuade
16. distal
17. face
18. flat
19. flop
20. front
21. fronting
22. hate
23. hook
24. mar
25. modest
26. nod
27. obverse
28. over
29. peen
30. prone
31. right
32. rights
33. rococo
34. sense
35. sensed
36. sensing
37. sexism
38. side
39. thick
40. thin

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