ruggedness

/'rʌgidnis/
Noun
  1. the quality of being difficult to do
    • he assigned a series of problems of increasing hardness
    • the ruggedness of his exams caused half the class to fail
  2. the quality of being topologically uneven
    • the ruggedness of the mountains
  3. the property of being big and strong

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ruggedness
The ruggedness of the mountain trail made the hike a challenge.