(1):

(n.) Want of knowledge; lack of sense; vacuity of mind.

(2):

(n.) The state of being empty; absence of contents; void space; vacuum; as, the emptiness of a vessel; emptiness of the stomach.

(3):

(n.) Want of solidity or substance; unsatisfactoriness; inability to satisfy desire; vacuity; hollowness; the emptiness of earthly glory.