Sorry, no online dictionaries contain the exact phrase not understandable.
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Reverse dictionary results:
1. incomprehensible
 2. unintelligible
3. inscrutable
4. unfathomable
5. cryptic
6. imponderabilia
7. incognoscible
8. indistinguishable
9. undecidable
10. undistinguishable
 11. bottomless
12. immeasurableness
13. imperceptible
14. imperceptibly
15. impervious
16. imponderable
17. impossible dream
18. inappreciable
19. incomunicado
20. indecipherable
 21. indeterminate
22. indiscernible
23. invariable
24. invisibility
25. irreal
26. latent fingerprint
27. nontrivial
28. unclear
29. undeclined
30. undiscernable
 31. unheard of
32. unrecognisably
33. unseeable
34. unthinkable
35. unutterability
36. unvisible
37. anoetic

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