形容词

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

1. unproductive of success

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

    Synonym: bootlessfutilesleevelessvain