国语辞典食之无味，弃之可惜
吃起来毫无滋味，丢弃又觉得可惜。语本《三国志．卷一．魏书．武帝纪》裴松之注引《九州春秋》：「夫鸡肋，弃之如可惜，食之无所得，以比汉中，知王欲还也。」比喻东西没什么用处，又舍不得丢掉。也作「食之无味，弃之不甘」。
英语 lit. to be hardly worth eating, but it would still be a pity to discard it (idiom), fig. some things have little to no value, yet one is still reluctant to part with them
© 汉典