Sorry, no online dictionaries contain the exact phrase is not believable.
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Reverse dictionary results:
1. unbelievable
 2. lame
3. unconvincing
4. fabulous
5. fantastic
6. tall
7. inconceivably
8. likely
9. probable
10. credibility
 11. plausible
12. convincing
13. credit
14. ism
15. amazing
16. candid
17. devious
18. dishonest
19. disingenuous
20. extraordinary
 21. false
22. genuine
23. glib
24. hollow
25. hollowing
26. honest
27. iffy
28. implausible
29. inconceivable
30. incredible
 31. incredibly
32. incredulous
33. infallible
34. insincere
35. mouth-made
36. safe
37. shady
38. simple
39. simples
40. single

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You can look up the words in the phrase individually using these links:   is ?   not ?   believable ?
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