Sorry, no online dictionaries contain the exact phrase not in operation.
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Reverse dictionary results:
1. inactive
2. idle
3. dormant
4. unused
5. out of service
6. empty
7. inefficiency
8. no good
9. solitary
10. abortive
11. absentminded
12. abstract
13. anticlimactic
14. awl
15. beside the point
16. effectless
17. frustraneous
18. frustrate
19. futile
20. gratuitous
21. handwaving
22. ill-equipped
23. incompetent
24. inconsequential
25. inconsiderable
26. ineffective
27. ineffectively
28. ineffectual
29. ineffectualness
30. inefficacious
31. inefficaciously
32. inefficaciousness
33. inefficacy
34. inefficient
35. inept
36. meaningless
37. moot
38. needless
39. neither here nor there

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