Adverb:

1. without forethought or plan; inadvertently;

   "came upon the diamond unawares"
   

2. suddenly and unexpectedly;

   "rain caught them unawares"
   "sorrow comes to all, and to the young it comes with bittered agony because it takes them unawares"
   

3. at a disadvantage;

   "I was caught short"
   

unwittinglyadv.不知不觉地；无意地

by surpriseadv.突然(冷不防；出其不意地)

off guard不警戒， 不警惕,，不提防

unexpectedlyadv.未料到地；意外地

on the hopadv.到处奔忙(出其不意)

shortadj.短的；矮的；短期的；短缺的；简略的；粗暴无礼的；[语]短音的adv.缺少；未达到；半中间(打断)；过早地(终止)n.<英口>烈酒；电影短片；[电]短路v.(使)短路

1. You caught us unawares by coming so early.
   你来得这麽早，我们都很惊讶。
2. She came upon him unawares as he was searching her room.
   她撞见他正在搜查她的房间。
3. I must have dropped my keys unawares.
   我准是不留神把钥匙丢了。
4. He must have left it somewhere unawares.
   他一定是不小心把它遗忘在什麽地方了。