ruggedness

noun

1. The state of being rugged, or degree to which something is rugged.

2. A rugged or irregular feature.

3. The property of being big and strong

   Similar: huskiness, toughness

4. The quality of being topologically uneven

   “the ruggedness of the mountains”

5. 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”

   Similar: hardness