Vacuous

Vacuous, vak′ū-us, adj. empty, void: without intelligence, unexpressive.—v.t. Vac′uāte, to make empty.—ns. Vacuā′tion; Vac′uist, one who thinks there are empty spaces in nature; Vacū′ity, emptiness: space unoccupied: idleness, listlessness; Vac′uōle, a very small cavity in the tissue of organisms; Vac′uousness; Vac′ūum, vacant or empty space: a space empty or devoid of all matter:—pl. Vac′ūa; Vac′ūum-brake, a brake working on the principle of keeping up a vacuum in a continuous pipe or pipes extending under the train, and in brake-cylinders connected to them under each vehicle, the air being sucked out by ejectors or pumps on the locomotive; Vac′ūum-gauge, a gauge for indicating to what extent a vacuum is produced; Vac′ūum-pan, a vessel for boiling saccharine juices in a partial vacuum in sugar-making; Vac′ūum-tube, a sealed glass tube in which a vacuum has been made, employed to examine the effects of a discharge of electricity through air or gas rarefied or exhausted. [L. vacuus, empty.]