What is the synonym of difficult?

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Tags

1. #wearisome
2. #exacting
3. #sisyphean
4. #demanding
5. #arduous
6. #challenging
7. #uphill
8. #stiff
9. #attended
10. #titanic
11. #backbreaking
12. #rigorous
13. #strenuous
14. #taxing
15. #gargantuan
16. #bothersome
17. #painful
18. #obstacles
19. #onerous
20. #heavy
21. #effort
22. #labored
23. #laborious
24. #troublesome
25. #requiring
26. #herculean
27. #burdensome
28. #trying