What word means showing continuous effort?

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Tags

1. #interruption
2. #round
3. #interminable
4. #timeless
5. #perpetual
6. #without
7. #ceaseless
8. #incessant
9. #constant
10. #persistent
11. #relentless
12. #unfailing
13. #unremitting
14. #eternal
15. #endless
16. #continual
17. #unending
18. #uninterrupted
19. #everlasting
20. #occurring
21. #nonstop
22. #around
23. #ongoing
24. #clock
25. #unceasing
26. #existing