1. So far the search for the missing boy is fruitless.
    对失踪男孩的搜寻至今仍无结果。

2. The search proved fruitless.
    搜寻没有结果。

1. 不结果实的：fruitive 能产果实的 | fruitless 不结果实的 | fruitlessly 徒劳地

2. 公共查询·英语单词大全

2. 不结果的：fruitful 产量多的 | fruitless 不结果的 | frustrate 挫败

3. fruitless

3. 无成果的：frontless 无前部的 | fruitless 无成果的 | futureless 没有前途的

4. 徒劳的：水果主义 fruitarianism | 徒劳的 fruitless | 生果金 fruit-money payments

1. 无结果的;无成效的;徒劳的
    Fruitless actions, events, or efforts do not achieve anything at all.

    e.g. It was a fruitless search...
           搜寻工作毫无结果。
    e.g. Talks have so far have been fruitless.
           会谈到目前为止未见成果。

1. unproductive of success

    e.g. a fruitless search
           futile years after her artistic peak
           a sleeveless errand
           a vain attempt

    Synonym: bootlessfutilesleevelessvain