hollow >> ˈhɒləʊ
Definition: [adjective] having a hole or empty space inside.
Example: a hollow metal tube
Definition: [adjective] without real significance or value.
Example: the result was a hollow victory
Definition: [noun] a hole or depression in something.
Example: a hollow at the base of a large tree
Definition: [verb] form by making a hole.
Example: a tunnel was hollowed out in a mountain range