Sorry, no online dictionaries contain the exact phrase requiring a lot of effort.
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Reverse dictionary results:
1. strenuous
2. arduous
3. demanding
4. laborious
5. exhausting
6. grinding
7. laborous
8. laboured
9. onerous
10. operose
11. toilsome
12. backbreaking
13. breakback
14. burdenous
15. burdensome
16. difficult
17. grueling
18. gruelling
19. hard
20. labourious
21. laboursome
22. lichtly
23. moliminous
24. sweaty
25. taxing
26. tedious
27. toilful
28. trying
29. worky
30. burden
31. challenging
32. cumbersome
33. cumbrous
34. difficultate
35. drudgingly
36. hard-fought
37. labor-intensive

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