having a space or cavity inside; not solid; empty

a hollow sphere.

having a depression or concavity

a hollow surface.

sunken, as the cheeks or eyes.

(of sound) not resonant; dull, muffled, or deep

a hollow voice.

without real or significant worth; meaningless

a hollow victory.

insincere or false

hollow compliments.

hungry; having an empty feeling

I feel absolutely hollow, so let's eat.

an empty space within anything; a hole, depression, or cavity.

a valley

They took the sheep to graze in the hollow.

Foundry . a concavity connecting two surfaces otherwise intersecting at an obtuse angle.

to make hollow (often fol. by out )

to hollow out a log.

to form by making something hollow (often fol. by out )

to hollow a place in the sand; boats hollowed out of logs.

to become hollow.

in a hollow manner

The politician's accusations rang hollow.

beat all hollow

to surpass or outdo completely

His performance beat the others all hollow. Also, beat hollow.

adjective

convex , full , raised , solid , high , light , soft , earnest , meaningful , sincere , substantial , frank , genuine , honest , real , truthful , protuberant

noun

solid

verb

fill , make convex , raise

adjective

alveolate , arched , carved out , cavernous , cleft , concave , cupped , cup-shaped , curved , deep-set , depressed , dimpled , excavated , incurved , indented , infundibular , notched , not solid , pitted , striated , sunken , troughlike , unfilled , vacant , vaulted , void , clangorous , dull , echoing , flat , ghostly , low , muffled , mute , muted , resounding , reverberant , ringing , roaring , rumbling , sepulchral , sounding , thunderous , toneless , vibrant , vibrating , empty , fruitless , futile , idle , nugatory , otiose , pointless , specious , unavailing , useless , vain , worthless , cynical , deceitful , faithless , flimsy , hypocritical , insincere , treacherous , unsound , weak , cannulated , false , gaunt , lacunal , lacunar , tympanic

noun

basin , bottom , bowl , cave , cavern , cavity , chamber , channel , cleft , concavity , crater , cup , dale , den , depression , dimple , dip , dish , excavation , groove , gulf , hole , indentation , notch , pit , pocket , sag , scoop , sinkage , sinkhole , socket , trough , vacuity , valley , void , sink , alcove , concave , correi , recess , sinus , slough

verb

channel , chase , corrugate , dent , dig , dish , ditch , excavate , furrow , gorge , groove , indent , notch , pit , rabbet , remove , rut , scoop , shovel , trench , alcove , alveolus , basin , cave , cavern , cavernous , cavity , chamber , concave , cove , crater , cupped , curved , deceitful , deep , den , depressed , depression , dip , empty , faithless , false , ghostly , glen , hole , meaningless , muffled , pocket , pointless , resounding , sepulchral , sinus , socket , specious , sunken , thunderous , unsound , vacant , vain , valley , void , worthless