The Collaborative International Dictionary of English v.0.48:
Difficultness \Dif"fi*cult*ness\, n. Difficulty. [R.] --Golding. [1913 Webster]WordNet (r) 3.0 (2006):
difficultness n 1: the quality of being difficult; "they agreed about the difficulty of the climb" [syn: difficulty, difficultness] [ant: ease, easiness, simpleness, simplicity]