1 with a hole or empty space inside 空心的: a hollow tree 空心树

2 (used about parts of the face) sinking deep into the face （指脸的部份）凹陷的: hollow cheeks 凹陷的双颊hollow-eyed 眼睛凹陷的

3 not sincere 不诚实的；虚伪的: a hollow laugh/voice 虚伪的笑声╱话音hollow promises/threats 虚假的诺言；虚张声势的恫吓

4 (used about a sound) seeming to come from a hollow place （指声音）似由空洞传来的: hollow footsteps 低沉的脚步声