not producing or able to produce large amounts of goods, crops, or other commodities 生产不多的;不丰饶的 unproductive land must be reforested. 贫瘠土地必须再植林。 ■(of an activity or period) not achieving much; not very useful 行动,时期)成果不多的;无用的 unproductive meetings. 徒劳的会议。