Sorry, no online dictionaries contain the exact phrase opposite of deleterious.
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Reverse dictionary results:
1. worse
2. ill
3. oll
4. sweet
5. taint
6. attainted
7. bad
8. harmful
9. adiaphorous
10. antimephitic
11. resist
12. alloy
13. blight
14. blighted
15. burden
16. containment
17. purity
18. tainted
19. tolerance
20. adverse
21. bear
22. bold
23. charybdis
24. devil
25. dissuade
26. down
27. foe
28. hit
29. negative
30. poor
31. put
32. scylla
33. anticor
34. dystopia
35. aap
36. abuse
37. aggression
38. aggressive
39. alkaloid
40. antiblastic

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