(1)空着(缺)的，未被占用的(unoccupied;not in use)：a～seat/chair/table空座位/椅子/桌子;～lavatory 盥洗室无人使用;a～stadium/cab 没有观众的体育场/空驶出租车;a～hotel room旅馆空余房间;a～apartment/house无人居住的公寓/房屋; a～piece of land空地;a～job空缺职位;apply for a～post 申请空缺职务;situations～招聘广告栏目;a～estate 无继承人的产业;The position of headmaster has fallen～. 校长职位成为空缺。〖同〗unoccupied，empty，unfilled，abandoned;〖反〗occupied，filled，taken，engaged，full，rented，inhabited;

(2)茫然，无表情(showing no thought， intelligence or interest)： have (give) a～stare/expression/look 毫无表情地凝视/显出茫然的表情/神色茫然;〖同〗blank，expressionless，empty，dull;〖反〗expressive，meaningful，thoughtful，reflective;

(3)(心灵)空虚的，愚蠢的 (senseless;stupid)： have (give) a～mind/laugh 头脑空空/傻笑;He looks rather～. 他看上去傻乎乎的。

(4)空闲的(free from work)：～hours 闲暇时光;a great deal of～time on one's hands 手头大量的空闲时间;〖同〗leisure，unoccupied， free，idle，unemployed;〖反〗occupied，filled，taken，engaged，full，busy，employed;

→′vacantly adv 茫然地;

【辨异】vacant与blank和empty的区别见BLANK。