English▸ adjective (of premises) having no fixtures, furniture, or inhabitants; empty. Compare with unoccupied (SENSE 1 OF THE adjective).
▪ (of a position or office) not filled:
the president resigned and the post was left vacant.
▪ (of a person or their expression) having or showing no intelligence or interest:
a vacant stare.
– ORIGIN Middle English : from Old French, or from Latin vacant- ‘remaining empty’, from the verb vacare.