fruitless
Definition
Having no useful result; unsuccessful or unproductive.
中文 没有有用结果的；不成功的或无效的。
Example
"They made a fruitless search for the missing keys under the sofa."
Having no useful result; unsuccessful or unproductive.
中文 没有有用结果的；不成功的或无效的。
"They made a fruitless search for the missing keys under the sofa."