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|Noun||1.||difficultness - the quality of being difficult; "they agreed about the difficulty of the climb"|
effortfulness - the quality of requiring deliberate effort
asperity, rigor, rigorousness, rigourousness, severeness, severity, rigour, grimness, hardship - something hard to endure; "the asperity of northern winters"
ruggedness, 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"
subtlety, niceness - the quality of being difficult to detect or analyze; "you had to admire the subtlety of the distinctions he drew"
quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare