1. having an empty space inside; not solid
2. lacking substance, meaning, or sincerity
3. producing a deep, echoing sound

1. a hole or empty space in something
2. a small valley

1. to make hollow by removing the inside

Examples

• The tree trunk was hollow inside.
• His hollow promises meant nothing to her.
• The footsteps made a hollow sound in the empty hallway.
• Water collected in the hollow of the rock.
• They built their cabin in a peaceful hollow.
• She hollowed out the pumpkin to make a jack-o’-lantern.
• The victory felt hollow without his teammates there.
• Birds nested in the hollow tree.