What is a better word for hard?

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Tags

1. #challenging
2. #effortful
3. #rigorous
4. #tough
5. #difficult
6. #rough
7. #toilsome
8. #demanding
9. #moiling
10. #strenuous
11. #severe
12. #gruelling
13. #testing
14. #killer
15. #sweaty
16. #rugged
17. #stiff
18. #backbreaking
19. #augean
20. #herculean
21. #murderous
22. #laborious
23. #shovel
24. #heavy
25. #grueling
26. #hellacious
27. #uphill
28. #formidable
29. #arduous
30. #exacting