Sorry, no online dictionaries contain the exact phrase opposite of suboptimal.
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Reverse dictionary results:
1. optimal
 2. ideal
3. perfect
4. excellent
5. best
6. a good deal
7. best of both worlds
8. bettermost
9. bigtime
10. mainly
 11. way
12. basically
13. by and large
14. down pat
15. for the most part
16. going
17. ideally
18. largely
19. mo
20. most
 21. mostly
22. much
23. proper
24. relevant
25. still
26. summum bonum
27. superlative degree
28. a lot
29. a to z
30. ad lib
 31. all
32. amain
33. amaine
34. close
35. consummate
36. convenience
37. flat

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