late 14c., "idle," from un- (1) "not" + past participle of occupy (v.). In reference to ground, etc., "not possessed, not made use of," from early 15c.
权威例句
1. The house was unoccupied at the time of the explosion.
爆炸发生的时候房子里没有人。
2. The house was unoccupied and in a bad state of disrepair.