futile
英 ['fjuːtaɪl]
美['fjʊtaɪl]
	    - adj. 无用的;无效的;没有出息的;琐细的;不重要的
 
英英释意
- 1. producing no result or effect;
 - "a futile effort"
 - "the therapy was ineffectual"
 - "an otiose undertaking"
 - "an unavailing attempt"
 
- 2. unproductive of success;
 - "a fruitless search"
 - "futile years after her artistic peak"
 - "a sleeveless errand"
 - "a vain attempt"