Definitions

1. past participle

past participle of sink, describing something that has sunk or has been sunk

“The sunken ship was a grave for its crew.”

2. adjective

descended or dropped below the surface or level of something

“The sunken garden in the castle was a peaceful oasis.”

3. noun

a depression or hollowed area, especially in the ground

“The sunken area in the field was a result of erosion.”