Nature:
* Tough as a mountain goat clinging to a sheer cliff. (Emphasizes resilience and tenacity)
* Tough as a weathered oak tree that's stood through countless storms. (Emphasizes endurance and strength)
* Tough as a spider's web, delicate yet capable of ensnaring prey much larger than itself. (Emphasizes surprising strength hidden within a seemingly fragile exterior)
Humanity:
* Tough as a seasoned sailor navigating treacherous waters. (Emphasizes experience and adaptability)
* Tough as a sculptor chiseling away at stone, relentlessly pursuing their vision. (Emphasizes determination and perseverance)
* Tough as a seasoned storyteller weaving tales of hardship and triumph. (Emphasizes emotional resilience and strength)
Miscellaneous:
* Tough as a well-worn pair of boots that have seen countless miles. (Emphasizes endurance and practicality)
* Tough as a well-oiled machine, working efficiently and flawlessly. (Emphasizes reliability and precision)
* Tough as a diamond, unyielding and enduring even under immense pressure. (Emphasizes inner strength and unbreakable spirit)