definition of
ruggedness

[1] #1 ruggedness n. [huskiness, toughness] the property of being big and strong. wn

[2] #2 ruggedness n. the quality of being topologically uneven; "the ruggedness of the mountains". wn

[3] #3 ruggedness n. [hardness] 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". wn