Sorry, no online dictionaries contain the exact phrase population optimism.
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Reverse dictionary results:
1. morale
2. pessimism
3. complacency
4. hope
5. pollyanna
6. strength
7. can
8. chipper
9. impregnate
10. negative
11. pickup
12. relief
13. rosy
14. aseptic
15. assert
16. bounce back
17. cold
18. cool
19. cryonics
20. delirious
21. esprit
22. gusto
23. hanger-on
24. live
25. ooze
26. orgasm
27. orgasmic
28. orgasms
29. predate
30. prescience
31. ray
32. spew
33. stimulant
34. vigor
35. volatile
36. wish
37. zeitgeist
38. anticipation
39. confidence
40. conservatism

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You can look up the words in the phrase individually using these links:   population ?   optimism ?
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