What is the synonym of tough?

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Tags

1. #unyielding
2. #uncontrollable
3. #laborious
4. #troublesome
5. #ferocious
6. #puzzling
7. #uproarious
8. #desperate
9. #riotous
10. #ruffianly
11. #fierce
12. #intricate
13. #savage
14. #resisting
15. #difficult
16. #onerous
17. #rapacious
18. #unmanageable
19. #terrible
20. #severe