Sorry, no online dictionaries contain the exact phrase opposite of pessimistic.
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Reverse dictionary results:
1. negative
 2. bear
3. black
4. negativism
5. worst
6. cynical
7. naysaying
8. conservative
9. croak
10. cynic
 11. cynicism
12. depression
13. dim
14. knocker
15. negativity
16. pessimist
17. sour
18. adversary
19. keep
20. square
 21. strike
22. thin
23. clas
24. classy
25. rosy
26. saturnine
27. active
28. agon
29. aside
30. black-faced
 31. breakwater
32. carpet slipper
33. carse
34. causeway
35. change
36. climax
37. coffee table
38. competitive
39. conflict
40. curvet

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