1.Definition: the property of being big and strong

Related Noun(s):huskiness, toughness

Category: General

2.Definition: 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"

Related Noun(s):hardness

Category: General

3.Definition: the quality of being topologically uneven

"The ruggedness of the mountains"

Category: General