Something that is unproductive does not produce any good results.
例句
Research workers are well aware that much of their time and effort is unproductive.研究人員很清楚，他們的很多時間和精力全都是白費(fèi)。...increasingly unproductive land.越來越貧瘠的土地
英英詞典釋義
Adjective
1. not producing or capable of producing;
"elimination of high-cost or unproductive industries"
2. not producing desired results;
"the talks between labor and management were unproductive"