久而久之不苦不痒久而久之不甜不舒
[jiŭ ér jiŭ zhī bù kŭ bù yăng jiŭ ér jiŭ zhī bù tián bù shū]
'With time it becomes neither bitter nor numb yet not sweet nor soothing' - reflects emotional detachment over time where once vivid emotions have dimmed into indifferent feelings towards people or events.