hollow

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Having a cavity, gap, or space within: a hollow wall.
2. adj. Deeply indented or concave; sunken: "His bearded face already has a set, hollow look” ( Conor Cruise O'Brien).
3. adj. Without substance or character: a hollow person. See Synonyms at vain.
4. adj. Devoid of truth or validity; specious: "Theirs is at best a hollow form of flattery” ( Annalyn Swan).
5. adj. Having a reverberating, sepulchral sound: hollow footsteps.
6. n. A cavity, gap, or space: a hollow behind a wall.
7. n. An indented or concave surface or area.
8. n. A void; an emptiness: a hollow in one's life.
9. n. A small valley between mountains.
10. v. To make hollow: hollow out a pumpkin.
11. v. To scoop or form by making concave: hollow out a nest in the sand.
12. v. To become hollow or empty.

Century Dictionary and Cyclopedia

1. n. A cavity; a depression or an excavation below the general level, as of the ground, or in the substance of anything; an empty space in anything; a concavity.
2. n. Specifically, a concave space of ground; a piece or tract of land lower than the general level, or hemmed in by hills: used in many place-names in the United States: as, Sleepy Hollow in New York.
3. n. A concave plane used in working moldings.
4. n. A strip of thick paper or of pasteboard cut to the exact height and thickness required for a book for which the boards and cloth are intended, and which acts as a gage for the guidance of the case-makers, and as a stiffener for the cloth at the back of the book between the boards.
5. Having a cavity within; having an empty space in the interior: as, a hollow tree; a hollow rock; a hollow sphere.
6. Having a concavity; concave; sunken: as, a hollow way or road.
7. Resembling sound reverberated from a cavity, or producing such a sound; deep; low.
8. Empty; without contents; hence, without pith or substance; fruitless; worthless: as, a hollow victory; a hollow argument.
9. Not sincere or faithful; false; deceitful; not sound: as, a hollow heart.
10. Void of meaning or truth; empty; baseless: as, hollow oaths; a hollow mockery.
11. Thorough; complete; out-and-out.
12. Having, as wool, the fibers torn apart, so that it is light and open.
13. Synonyms Empty, void, cavernous.
14. Faithless, iusincere, treacherous, hypocritical.
15. To make hollow; excavate; make empty.
16. To bend into a curved or concave form.
17. Beyond doubt or question; utterly; completely; out-and-out: often with all for emphasis: as, he beat him hollow, or all hollow; he carried it hollow.
18. A variant of hollo.

Wiktionary

1. v. To urge or call by shouting; to hollo.
2. n. A small valley between mountains; "he built himself a cabin in a hollow high up in the Rockies"
3. n. A sunken area in something solid.
4. n. US A sunken area, the equivalent to a copse in British English.
5. n. figuratively A feeling of emptiness.
6. v. to make a hole in something; to excavate (transitive)
7. adj. Having an empty space or cavity inside.
8. adj. of a sound Distant, eerie; echoing, reverberating, as if in a hollow space; dull, muffled; often low-pitched.
9. adj. figuratively Without substance; having no real or significant worth; meaningless.
10. adj. figuratively Insincere, devoid of validity; specious.

GNU Webster's 1913

1. adj. Having an empty space or cavity, natural or artificial, within a solid substance; not solid; excavated in the interior
2. adj. Depressed; concave; gaunt; sunken.
3. adj. Reverberated from a cavity, or resembling such a sound; deep; muffled.
4. adj. Not sincere or faithful; false; deceitful; not sound
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. To make hollow, as by digging, cutting, or engraving; to excavate.
8. adv. colloq. Wholly; completely; utterly; -- chiefly after the verb to beat, and often with all. See all, adv.
9. interj. Hollo.
10. v. To shout; to hollo.
11. v. To urge or call by shouting.

WordNet 3.0

1. n. a cavity or space in something
2. adj. devoid of significance or point
3. n. a small valley between mountains
4. adj. not solid; having a space or gap or cavity
5. n. a depression hollowed out of solid matter
6. adj. as if echoing in a hollow space
7. v. remove the interior of
8. v. remove the inner part or the core of