Synonyms and related words :
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, stoma, stuffy, sunk, sunken, superficial, tasteless, tedious, throwing open, toneless, tongue in cheek, trough, unavailing, uncandid, uncorking, unfilled, unfrank, unlively, unprofitable, unrelieved, unserious, unstopping, vacant, vacuity, vacuous, vain, valley, valueless, vapid, vault, void, vug, well, white, with nothing inside, without content, wooden, worthless, yawn, yawning abyss