Sorry, no online dictionaries contain the exact phrase opposite of sullen.
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Reverse dictionary results:
1. saturnine
2. black
3. glum
4. gloom
5. frown
6. frowning
7. sour
8. sulky
9. ugly
10. refractory
11. against
12. fair
13. negative
14. yin
15. dogged
16. grouch
17. petulant
18. pout
19. sulking
20. truculent
21. henbit
22. lightfoot
23. periwinkle
24. axe
25. axing
26. barrage
27. beauty spot
28. black-faced
29. blip
30. bold-faced
31. bunk
32. chain-smoker
33. crookes space
34. curl
35. curls
36. dense
37. depression
38. fairy ring
39. fender
40. firebase

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