hollow

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. Source: opted

2. a. Depressed; concave; gaunt; sunken. Source: opted

3. a. Reverberated from a cavity, or resembling such a sound; deep; muffled; as, a hollow roar. Source: opted

4. a. Not sincere or faithful; false; deceitful; not sound; as, a hollow heart; a hollow friend. Source: opted

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. Source: opted

6. n. A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel. Source: opted

7. v. t. To make hollow, as by digging, cutting, or engraving; to excavate. Source: opted

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. Source: opted

9. interj. Hollo. Source: opted

10. v. i. To shout; to hollo. Source: opted

11. v. t. To urge or call by shouting. Source: opted

12. adj. not solid; having a space or gap or cavity Source: wordnet

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