1. 愣：stupefaction /麻醉/昏睡/昏迷/ | stupefied /愣/ | stupefy /麻醉/

2. 发愣的：phantasm 幻像 | stupefied 发愣的 | den 肮脏简陋的小房间

3. 无聊的时候你大多会做些什么：寄这封邮件给你的上一个人是谁: no | 无聊的时候你大多会做些什么: stupefied | 你住的最远距离的一个朋友是谁: a man

adj

1. in a state of mental numbness especially as resulting from shock

e.g. he had a dazed expression on his face
lay semiconscious, stunned (or stupefied) by the blow
was stupid from fatigue

Synonym: dazedstunnedstupid(p)

2. as if struck dumb with astonishment and surprise

e.g. a circle of policement stood dumbfounded by her denial of having seen the accident
the flabbergasted aldermen were speechless
was thunderstruck by the news of his promotion

Synonym: dumbfoundeddumfoundedflabbergastedthunderstruckdumbstruckdumbstricken