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Definition of hollow : 1. 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.
2. A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel.
3. Depressed; concave; gaunt; sunken.
4. 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.
5. Hollo.
6. Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend.
7. Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar.
8. To make hollow, as by digging, cutting, or engraving; to excavate.
9. To shout; to hollo.
10. To urge or call by shouting.
11. Wholly; completely; utterly; - chiefly after the verb to beat, and often with all; as, this story beats the other all hollow. See All, adv.

Synonyms:

plangent, grasp, back, toil, maw, travail, yowl, cut into, bellow, full, chest, roar, hollering, muffled, recessed, ringing, dig, chink, muddle, abyss, deep, thunderous, kettle of fish, overcome, fix, poke, sepulchral, vibrant, hollow out, dull, jam, fatuous, ambiguity, apprehend, vain, mute, savvy, dig up, reverberant, yap, abdomen, crack, low-pitched, unfilled, dead, core out, roaring, holloa, dished, booming, excavate, heavy, bloodshot, mindless, deep-set, empty, inane, my word is my bond, sunken, flank, doe-eyed, nonsense, holla, otiose, cleft, cavity, derelict, gob, surpass, hollo, hole, turn over, pickle, solemn, bare, asinine, blank, resounding, deserted, comprehend, blowhole, stab, aperture, loud, dig out, fistular, tubular, two-edged, low, beady, girth, unearth, compass, cannular, empty-bellied, holler, crater, ambiguous, void, ill-defined, trap, broken, cranny, fistulous, moil, grind, uncrowded, bug-eyed, mess, turn up, vacant, bellowing, drudge, beat, cross your heart (and hope to die), cavernous, abandoned, meaningless, body, belly button, prod, hazel, on my honor, hollowed, heart, equivocal, channel, golf hole, cross-eyed, ghostly, bass, belly, as good as your word, cryptic, fistulate, front, delve, close-set, labour, grok, blooming, idle, cakehole, jab, resonant, labor, insincere, false, clear, vacuous, double-edged, get the picture

crater-like, round, arched, curved, dented, concave, vaulted, convex, raised, depressed, indented, bent

hungry, ravenous

flimsy, artificial, unsound

Usage examples:

• It was hollow, and the space inside it was large enough to hold a number of armed men. - "The Story of the Greeks", H. A. Guerber.
• The ground was hard and rough, covered with very sharp stones; though dry, it sounded hollow, and it seemed as though there were water under it. - "Southern Arabia", Theodore Bent Mabel Bent.
• Getting out of my hollow, I crawled forward on my hands and knees till I could catch a glimpse of the side road leading to that house; and there I lay flat on my face and watched. - "The Spy in Black", J. Storer Clouston.