—adj. 1. having a space or cavity inside; not solid; empty: a hollow sphere. 2. having a depression or concavity: a hollow surface. 3. sunken, as the cheeks or eyes.
4. (of sound) not resonant; dull, muffled, or deep: a hollow voice. 5. without real or significant worth; meaningless: a hollow victory. 6. insincere or false: hollow compliments. 7. hungry; having an empty feeling: I feel absolutely hollow, so let's eat.
—n. 1. an empty space within anything; a hole, depression, or cavity.
2. a valley: They took the sheep to graze in the hollow. 3. Foundry.a concavity connecting two surfaces otherwise intersecting at an obtuse angle.
—v.t. 1. to make hollow (often fol. by out): to hollow out a log. 2. to form by making something hollow (often fol. by out): to hollow a place in the sand; boats hollowed out of logs.
—v.i. to become hollow.
—adv. 1. in a hollow manner: The politician's accusations rang hollow. 2. beat all hollow, to surpass or outdo completely: His performance beat the others all hollow.Also,beat hollow.