Sorry, no online dictionaries contain the exact phrase opposite of pessimism.
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Reverse dictionary results:
1. optimism
2. pessimist
3. negative
4. negatively
5. mirth
6. optimist
7. sunshine
8. cheering
9. cheers
10. damnation
11. ambivalence
12. gloom
13. negativism
14. disillusionment
15. conservatism
16. cynicism
17. doom
18. fatalism
19. mistrust
20. nihilism
21. skepticism
22. darkly
23. inge
24. pejorism
25. pessimistic
26. pessimistically
27. pessimize
28. weltschmerz
29. defeatism
30. despair
31. despondency
32. distrust
33. egocentricity
34. hopelessness
35. insecurity
36. preoccupation
37. scepticism
38. seriousness
39. worlds
40. ab-

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