Absurd, Abyss, Antrum, Aperture, Arid, Armpit, Artificial, Bare, Baritone, Barren, Basin, Bass, Blah, Bland, Blank, Bleached, Bloodless, Booth, Bootless, Bowl, Box, Broaching, Cave, Cavern, Cavernous, Cavity, Cell, Chamber, Characterless, Chasm, Check, Clear, Clearing, Cleft, Cold, Compartment, Concave, Concavity, Contralto, Costly, Counterfeit, Crack, Crater, Crevasse, Crib, Crypt, Cup, Cupped, Cynical, Dale, Dead, Deceitful, Deceptive, Deep, Dell, Dent, Dented, Depressed, Depression, Depth, Devoid, Dip, Disclosure, Dish, Dished, Dishing, Dishonest, Disingenuous, Dismal, Dreary, Pointless, Poky, Ponderous, Pore, Profitless, Ravenous, Retire, Retiring, Retreat, Retreating, Reverberant, Sag, Scoop, Senseless, Sepulchral, Shaft, Sham, Shell, Sink, Sinus, Slot, Slow, Socket, Solemn, Space, Specious, Spiritless, Split, Spurious, Stall, Starved, Sterile, Stiff, Stodgy, Stoma, Stuffy, Sunk, Sunken, Superficial, Tasteless, Tedious, Toneless, Trough, Unavailing, Unfilled, Unprofitable, Unrelieved, Vacant, Vacuity, Vacuous, Vain, Valley, Valueless, Vapid, Vault, Void, Well, White, Wooden, Worthless, Yawn, Dredge, Dry, Dull, Dusty, Effete, Elephantine, Empty, Excavate, Excavation, Fade, Fallacious, False, Famished, Fatuous, Featureless, Feigned, Fistula, Flat, Fold, Follicle, Fontanel, Foramen, Fraudulent, Fruitless, Furrow, Futile, Gap, Gape, Glen, Gouge, Grave, Gulf, Heavy, Hiatus, Hold, Hole, Hungry, Hypocritical, Idle, Illusive, Impression, Inane, Indentation, Indented, Ineffective, Inlet, Insincere, Insipid, Interval, Jejune, Lacuna, Leaden, Leak, Lifeless, Low, Manger, Meaningless, Mendacious, Muffled, Null, Opening, Orifice, Outlet, Pale, Pallid, Passageway, Pedestrian, Pew, Pit, Plausible, Plodding, Pocket