Definition of difficulty noun from the Oxford Advanced Learner's Dictionary

Oxford3000

difficulty

noun
ˈdɪfɪkəlti
 
; ˈdɪfɪkəlti
 
plural difficulties
 
1 [countable, usually plural, uncountable] a problem; a thing or situation that causes problemsthe difficulties of English syntaxchildren with severe learning difficultiesWe've run into difficulties/difficulty with the new project.He got into difficulties while swimming and had to be rescued.The bank is in difficulty/difficulties.It was a time fraught with difficulties and frustration.2 [uncountable] the state or quality of being hard to do or to understand; the effort that something involvesI had considerable difficulty (in) persuading her to leave.I had no difficulty (in) making myself understood.The changes were made with surprisingly little difficulty.He spoke slowly and with great difficulty.We found the house without difficulty.They discussed the difficulty of studying abroad.
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You cannot say ‘have difficulty to do something’:I had difficulty to persuade her to leave.
3 [uncountable] how hard something isvarying levels of difficultyquestions of increasing difficulty