having a hole or empty space inside:
a \________ tube
If you have \______ cheeks or eyes, your cheeks curve in or your eyes look deep in your head because you are old, tired, or ill:
He was an elderly man with \_____ cheeks.
(of situations, feelings, or words) without value, or not true or sincere:
It was something of a \__________ victory - she won the case but lost all her savings in legal fees.