Sorry, no online dictionaries contain the exact phrase effectiveness intact.
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Reverse dictionary results:
1. cost-effectiveness
 2. derogation
3. effect
4. effete
5. efficiency
6. failure
7. fatigued
8. feeble
9. force
10. forceful
 11. functionality
12. half-assed
13. ineffectual
14. logic
15. performance
16. shape
17. shaped
18. shaping
19. speed
20. validity
 21. value
22. vigour
23. voice
24. weak
25. stand
26. whole
27. able
28. absolute
29. absoluteness
30. absolutism
 31. absurdity
32. abundance
33. abusive
34. accidental
35. accomplish
36. accomplished
37. accomplishment
38. acoustic
39. acoustic projection
40. acoustics

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You can look up the words in the phrase individually using these links:   effectiveness ?   intact ?
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