Sorry, no online dictionaries contain the exact phrase harmful in effect.
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Reverse dictionary results:
1. inimical
2. pest
3. pests
4. maleficent
5. baleful
6. bear
7. blast
8. deleterious
9. disagree
10. pernicious
11. prey
12. smite
13. innocuous
14. accident
15. adverse
16. affect
17. bad
18. benign
19. compensate
20. consequences
21. cure
22. cured
23. damage
24. deadly
25. effects
26. evil
27. foul
28. fouled
29. fouling
30. harm
31. hurt
32. injury
33. insidious
34. interfere
35. malign
36. malignant
37. measure
38. negative
39. play
40. poison

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