All Words synonym/antonym practice test 24 of 42

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Question 1 of 10: Identify the synonyms/antonyms of "efficacy".

1. sufficiency

2. incapacity

3. strength

4. powerlessness

5. inability

6. incompetence

7. energy

8. capability

9. weight

10. effect

11. capableness

12. ability

13. ineffectuality

14. competence

15. idleness

16. vigor

17. inefficacy

18. performance

19. power

20. efficiency

21. inactivity

22. enervation

23. unproductiveness

24. force

25. lethargy

26. impotence

27. influence

28. failure

29. weakness

30. adequacy

31. ineffectiveness

32. ineffectualness

33. efficaciousness

34. success

35. effectiveness

36. uselessness

37. use

38. capacity

39. virtue

40. vigour

41. inefficiency

42. inadequacy

43. potency

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