食之无味，弃之不甘
shí​zhī​wú​wèi​qì​zhī​bù​gān

hardly worth keeping but a pity to lose

食之无味，弃之不甘 食之無味，棄之不甘 shí​zhī​wú​wèi​qì​zhī​bù​gān
hardly worth keeping but a pity to lose
Literal meaning is something that is tasteless to eat yet hard to throw away; used to describe things that have little value but one is still reluctant to part with them.