What is a synonym for not easy?

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Tags

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