1)unprofitable,无益的2)inconducive,无益的3)inutile,无益的4)profitless,无益的5)futile,无益的6)Sumptus inanes,无益的花费7)pernicious,有害无益的8)cry over spilt milk,作无益的后悔9)cry over spilled milk,为打翻的牛奶流泪,做无益的后悔10)inutility,无益
用法和例句
I know that you have lost your purse, but since it had happened, let it go, please don't cry over spilled milk