acarpous

这棵老苹果树已多年不结果实。

The old apple tree has been ___acarpous for several years.

在贫瘠的土壤里，许多植物会变得不结果实。

In barren soil, many plants tend to become ___acarpous.

园丁发现这株新杂交品种竟然完全不结果实。

The gardener found the new hybrid variety completely ___acarpous.