What is a better word for difficult?

Related questions

1. What is opportunity Wikipedia?
2. What are the challenges?
3. What are key opportunities?
4. What is equal opportunity workplace?
5. What means business opportunity?
6. How does creating jobs reduce poverty?
7. What is golden opportunity?
8. What is another term for opportunity cost?
9. What is an employment opportunity?
10. Can employers with less than 15 employees discriminate?

Tags

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