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n.
a factor causing trouble in achieving a positive result or tending to produce a negative result; "serious difficulties were encountered in obtaining a pure reagent"
n.
a condition or state of affairs almost beyond one's ability to deal with and requiring great effort to bear or overcome; "grappling with financial difficulties"
n.
an effort that is inconvenient; "I went to a lot of trouble"; "he won without any trouble"; "had difficulty walking"; "finished the test only with great difficulty"
n.
something immaterial that stands in the way and must be circumvented or surmounted; "lack of imagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"
n.
an annoying or frustrating or catastrophic event; "his mother-in-law's visits were a great trial for him"; "life is full of tribulations"; "a visitation of the plague"
n.
freedom from difficulty or hardship or effort; "he rose through the ranks with apparent ease"; "they put it into containers for ease of transportation"; "the very easiness of the deed held her back"
n.
skillful performance or ability without difficulty; "his quick adeptness was a product of good design"; "he was famous for his facility as an archer"