Sorry, no online dictionaries contain the exact phrase opposite of require.
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Reverse dictionary results:
1. optional
2. unnecessary
3. dispensable
4. elective
5. batable
6. condonable
7. errable
8. excuseable
9. arguable
10. challengeable
11. chastisable
12. contradictable
13. debatable
14. defensible
15. equivocal
16. evitable
17. exculpable
18. negotiably
19. refutable
20. remediably
21. remissible
22. willable
23. accomplishable
24. achievable
25. authorised
26. causable
27. confutable
28. consolable
29. construable
30. contestable
31. controllable
32. criticizable
33. debateable
34. devisable
35. disciplinable
36. discreditable
37. dismissible
38. disprovable
39. doable

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   require ?
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