ruggedness

Noun
  1. is a type of: strength - the property of being physically or mentally strong
    same as: huskiness, toughness
  2. is a type of: unevenness, variability - the quality of being uneven and lacking uniformity
    subtypes: hilliness - the quality of being hilly
  3. is a type of: difficultness, difficulty - the quality of being difficult
    same as: hardness

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