Sorry, no online dictionaries contain the exact phrase is a proof of tenacity.
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Reverse dictionary results:
1. determination
 2. perseverance
3. resilience
4. grit
5. steadfastness
6. pertinacious
7. pertinaciously
8. sticktoitiveness
9. bent
10. coolly
 11. diligence
12. firm
13. hard line
14. levelly
15. staunch
16. calmly
17. determinedly
18. durity
19. earnest
20. hardline
 21. instancy
22. longsuffering
23. placidly
24. serious
25. stolidly
26. assiduity
27. calmingly
28. composed
29. dedicated
30. earnestly
 31. in earnest
32. insistent
33. longanimity
34. mildly
35. perseveringly
36. pressing
37. quietly
38. resistantly

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