Sorry, no online dictionaries contain the exact phrase opposite in effect.
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Reverse dictionary results:
1. inverse
 2. adverse
3. backfire
4. counter
5. counteract
6. double-edged
7. invert
8. catch-22
9. counter-productive
10. boomerang
 11. about
12. actually
13. adapter
14. against
15. antagonistic
16. anti-
17. antiphrasis
18. antithesis
19. bang
20. bear
 21. blow
22. cancel
23. come
24. contrast
25. counterbalance
26. counterpoise
27. counterpoised
28. cut
29. dall
30. deep
 31. difference
32. double
33. eddy
34. evil
35. exposure
36. express
37. fact
38. fall
39. falls
40. fast

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