in·ef·fi·cien·cy /ˌɪnəˈfɪʃən(t)si/
無效率,無能
In·ef·fi·cien·cy n. The quality of being inefficient; lack of power or energy sufficient for the desired effect; inefficacy; incapacity; as, he was discharged from his position for inefficiency.
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inefficiency
n : unskillfulness resulting from a lack of efficiency [ant: efficiency]