inefficient
adjective uk/ˌɪn.ɪˈfɪʃ.ənt/ us/ˌɪn.ɪˈfɪʃ.ənt/
C1 低效率的；能力差的
not organized, skilled, or able to work in a satisfactory way
Existing methods of production are expensive and inefficient. 现行的生产方法既费钱效率又低。
I'm hopelessly inefficient at fixing things. 我永远也不会修理东西。