Sorry, no online dictionaries contain the exact phrase authentic challenge.
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Reverse dictionary results:
1. fake
 2. genuine
3. hoax
4. legitimate
5. original
6. real
7. recorded
8. trie
9. true
10. current
 11. document
12. record
13. use
14. posing
15. quaint
16. appeal
17. call
18. challenging
19. command
20. contest
 21. dent
22. difficult
23. difficulty
24. discredit
25. duel
26. easy
27. game
28. guard
29. hard
30. impeach
 31. impeachment
32. issue
33. pass
34. protest
35. quarrel
36. question
37. questioning
38. questions
39. rough
40. size

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You can look up the words in the phrase individually using these links:   authentic ?   challenge ?
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