A small valley between mountains.
A sunken area or unfilled space in something solid; a cavity, natural or artificial.
A sunken area.
A feeling of emptiness.
To make a hole in something; to excavate
To call or urge by shouting; to hollo.
(of something solid) Having an empty space or cavity inside.
(of a sound) Distant, eerie; echoing, reverberating, as if in a hollow space; dull, muffled; often low-pitched.
Without substance; having no real or significant worth; meaningless.
Insincere, devoid of validity; specious.
Concave; gaunt; sunken.
Pertaining to hollow body position
Completely, as part of the phrase beat hollow or beat all hollow.
Hey, hello