|Origin:||holh 'hole, hollow place'|
having an empty space inside:
a hollow tree
eyes etc where the skin sinks inwards:
He was short and thin, with hollow eyes.
a hollow sound is low and clear like the sound made when you hit something empty:
There was a hollow thump as the cars collided.
words, events, or people that are hollow have no real worth or value:
They won, but it was a hollow victory.
Even as he spoke, Ivan was well aware of the hollow ring to his words.
a hollow laugh or voice makes a weak sound and is without emotion
Sam laughed hollowly.
—hollowness noun [uncountable]