sunken
adjective uk/ˈsʌŋ.kən/ us/ˈsʌŋ.kən/
沉没的，沉入海底的
having fallen to the bottom of the sea
They're diving for sunken treasure. 他们潜入海中寻找沉没的宝藏。
低洼的，下陷的
at a lower level than the surrounding area
It was a luxurious bathroom, with a sunken bath. 那是一个豪华的浴室，里面有一个下沉式浴缸。
（尤指因为疲劳、疾病或年老眼睛或脸颊）凹陷的
(of eyes or cheeks) seeming to have fallen further into the face, especially because of tiredness, illness, or old age
She looked old and thin with sunken cheeks and hollow eyes. 她脸颊凹陷，目光空洞，看起来苍老瘦削。