Empty inside

adjective

1. Having an indentation or inward curve concave, sunken

   "hollow cheeks"

2. Having an unfilled or hollowed-out space within

   "a hollow tree"

3. Lacking in real value, sincerity, or substance false, meaningless

   "hollow promises"

4. Reverberating like a sound made in or by beating on a large empty enclosure muffled

   "heard a hollow sound when he knocked on the wall"

noun

1. An unfilled space cavity, hole

   "in the hollow of a tree"

2. A depressed or low part of a surface

verb

1. To remove the inside of to make hollow see hollow

   "a hollowed tree"

2. To form by removing the inside of something to form by making something hollow
3. To become hollow

   "his cheeks had hollowed"

adverb

1. So as to have a hollow see hollow sound

   "The sound echoed hollow in the cave."

2. Completely, thoroughly
3. so as to have a hollow sound : in a way that reflects a lack of real value, sincerity, or substance
4. completely, thoroughly —often used with all

phrasal verb

1. To remove the inside of (something) to make an empty space in (something)

   "The kids were hollowing out pumpkins."

2. To form (something) by digging or cutting the inside of something

   "Workers hollowed out a tunnel through the mountain."

geographical name

1. Village on the Hudson River in southeastern New York state population 9870

idiom

1. To seem untruthful or insincere

   "Their promises have a hollow ring."

idiom

1. In one's palm with the hand curved like a cup

   "I held the bead in the hollow of my hand."

idiom

1. To seem untruthful or insincere

   "Their promises ring hollow."