fruitless

形容词 fruitless:

1. unproductive of success
   同义词：bootless, futile, sleeveless, vain

1. All my efforts were fruitless.
   我所有的努力都白费了。
2. So far the search for the missing boy has been fruitless.
   到目前为止，还没有找到那失踪的男孩。
3. His struggle with adversity is fruitless.
   他徒与不幸挣扎而毫无结果。
4. Their negotiation was fruitless.
   他们的谈判没有结果。

fruit.less

adj.（形容词）
Producing no fruit.
不结果实的
Unproductive of success:
徒劳的：不产生益处或好处的：
例句：
a fruitless search.See Synonyms at futile
毫无结果的研究参见 futile

【引伸】
fruit.lessly
adv.（副词）
fruit.lessness
n.（名词）