futile

1. ADJ If you say that something is futile, you mean there is no point in doing it, usually because it has no chance of succeeding. (常因無(wú)成功的可能而) 無(wú)謂的

He brought his arm up in a futile attempt to ward off the blow. 他出于擋住這一擊的無(wú)謂企圖抬起了他的胳膊。