fruitless
/ˈfruːtlɪs/adjective
1
- failing to achieve the desired results; unproductive or useless无成果的; 无收益的; 无用的：
his fruitless attempts to publish poetry.
他发表诗作的徒劳尝试。
2
- (of a tree or plant) not producing fruit（树, 植物）不结果实的。
派生词