1. (a.) Having an empty space or cavity, natural or artificial, within a solid substance; not solid; excavated in the interior; as, a hollow tree; a hollow sphere.

2. (a.) Depressed; concave; gaunt; sunken.

3. (a.) Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar.

4. (a.) Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend.

5. (n.) A cavity, natural or artificial; an unfilled space within anything; a hole, a cavern; an excavation; as the hollow of the hand or of a tree.

6. (n.) A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel.

7. (v. t.) To make hollow, as by digging, cutting, or engraving; to excavate.

8. (adv.) Wholly; completely; utterly; -- chiefly after the verb to beat, and often with all; as, this story beats the other all hollow. See All, adv.

9. (interj.) Hollow.

10. (v. i.) To shout; to holler.

11. (v. t.) To urge or call by shouting.

absurd abysm abyss alveolation alveolus antrum aperture apparently sound arid armpit artificial bare baritone barren basin bass blah bland blank bleached bloodless boat-shaped boatlike booth bootless bowl bowl-shaped bowllike box broaching casuistic cave cave in cavelike cavern cavernous cavity cell cellule chamber characterless chasm check clear clearing cleft cold colorable colorless compartment concave concaved concavity contralto costly counterfeit crack crater craterlike crevasse crib crypt cup cup-shaped cupped cymbiform cynical dale dead deceitful deceptive deep deep-echoing deep-pitched deep-toned deepmouthed dell dent dented depressed depression depth devoid dig out dig up dip disclosure dish dish-shaped dished dishing dishlike dishonest disingenuous dismal draggy drearisome dreary dredge dry dryasdust dull dusty effete elephantine empty empty-headed empty-minded empty-pated empty-skulled enclosed space etiolated excavate excavation fade fallacious FALSE famished fatuitous fatuous featureless feigned fenestra fistula flat fold follicle fontanel foramen fraudulent fruitless funnel chest funnel-breasted funnel-chested funnel-shaped furrow futile gap gape gat glen gouge grave gulf heavy hiatus ho-hum hold hole hollow out hollow shell hollowed hungry hypocritical idle illusive impression inane incurve incurved incurving incurvous indentation indented ineffective inexcitable infundibular infundibuliform inlet insincere insipid interval jejune jesuitic lacuna laying open leaden leak lifeless low low-pitched low-spirited manger mealymouthed meaningless mendacious muffled navicular naviform null null and void opening opening up orifice otiose outlet overrefined oversubtle pale pallid passageway pedestrian pew philosophistic pit plausible plodding pocket pointless poky ponderous pore profitless punch bowl rattlebrained rattleheaded ravenous retire retiring retreat retreating reverberant sag saucer-shaped scaphoid scatterbrained scoop scyphate senseless sepulchral shaft sham shell sink sinkage sinkhole sinus slot slow socket solemn sophistic sophistical space specious spiritless split spoonlike spurious stall starved sterile stiff stodgy