decayed
v. C1 Advanced US //dəˈkeɪd// UK //dɪkˈeɪd// de·cayed
v. to fall into a bad state because of age, disease, or lack of care. You use this to describe things like old buildings, old teeth, or old wood.
v. to undergo a process of deterioration or disintegration, typically due to age, disease, or environmental factors. Often used in biological contexts to describe the breakdown of organic matter.
The old wooden fence has decayed over the years.
The dentist explained that the decayed tooth needed to be removed before the infection could spread to the rest of the jaw.
The once-magnificent palace stood in ruins, its stone walls decayed by centuries of exposure to the harsh coastal winds and relentless salt spray.