Sorry, no online dictionaries contain the exact phrase an infallible authority.
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Reverse dictionary results:
1. omniscient
2. expert
3. expertise
4. proficient
5. experienced
6. knowledgeable
7. practiced
8. practised
9. sciential
10. skill
11. thoroughpaced
12. versed
13. well-read
14. able
15. accomplished
16. adept
17. competent
18. enlightened
19. ept
20. experience
21. expertness
22. perficient
23. skilled
24. specialized
25. technically
26. versant
27. well-qualified
28. ace
29. capital
30. consummate
31. dab
32. formality
33. knowing
34. learned
35. learnedly
36. leet
37. seasoned

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