Sorry, no online dictionaries contain the exact phrase opposite of crucial.
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Reverse dictionary results:
1. acute
 2. polar
3. critical
4. needed
5. asap
6. tide
7. armageddon
8. basic
9. crunch
10. dire
 11. distinction
12. essence
13. essential
14. grave
15. high
16. issue
17. key
18. necessary
19. principal
20. showdown
 21. climax
22. keystone
23. acidic
24. afar
25. against
26. alien
27. ally
28. alt
29. anger
30. anode
 31. another
32. antipodal
33. ascetic
34. ashen
35. atheism
36. away
37. awkward
38. back
39. bak
40. barb

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