Sorry, no online dictionaries contain the exact phrase highly improbable.
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Reverse dictionary results:
1. unlikely
 2. doubtful
3. far-fetched
4. implausible
5. doubtlessness
6. dubious
7. if
8. perhaps
9. disbelieving
10. don't know
 11. doubt
12. doubtable
13. doubtfully
14. doubtingly
15. dubiously
16. dubitancy
17. in doubt
18. in question
19. incertitude
20. judgmentally
 21. suspicion
22. uncertainty
23. aporetical
24. discretionarily
25. dither
26. doubting
27. dubersome
28. dubiety
29. dubiousness
30. dubitate
 31. dubitation
32. dubitative
33. equivocal
34. incertainty
35. incredulous
36. maybe
37. misdoubt
38. misdoubting
39. nice

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You can look up the words in the phrase individually using these links:   highly ?   improbable ?
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