1 无益
unnecessary useless idle ineffective pointless vain worthless barren futile fruitless unprofitable ineffectual inoperative purposeless unavailing profitless bootless resultless ungainful uselessly futility barrenness vainness all for naught to no end
2 无益的
unnecessary useless idle ineffective pointless vain worthless barren futile fruitless unprofitable ineffectual inoperative purposeless unavailing profitless bootless resultless ungainful