Hollow knight edit sprites. See examples of hollow used in a sentence. in a hollow manner: The politician's accusations rang hollow. The meaning of HOLLOW is having an indentation or inward curve : concave, sunken. 2. Hollow definition: Having a cavity, gap, or space within. If you have hollow cheeks or eyes, your cheeks curve in…. having a hole or empty space inside: 2. HOLLOW definition: 1. To scoop or form by making concave: hollow out a nest in the sand. Synonym Discussion of Hollow.