Sorry, no online dictionaries contain the exact phrase opposite of ineffectual.
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Reverse dictionary results:
1. bomb
2. nerd
3. turkey
4. tame
5. chin
6. defang
7. doormat
8. frustrated
9. idle
10. idling
11. lapse
12. lapsing
13. reed
14. stultify
15. void
16. weak
17. argument
18. cast
19. casted
20. economic
21. ill
22. modest
23. neutralize
24. neutralized
25. out
26. over
27. reverse
28. helpful
29. meaningful
30. needed
31. strong side
32. aeneas silvius
33. aisha
34. amphotericin
35. ampicillin
36. antibacterial
37. antihypertensive
38. antisyphilitic
39. antiviral
40. bacitracin

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