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mad adj.〈尤英〉发疯的，疯狂的。
(辨析)指精神错乱的，或行为不理智的、失控的。
(例证) They realized that the captured spy had gone mad.
他们意识到那名被俘的间谍已经疯了。
The cartoon figure was depicted as a mad scientist.
这个卡通人物被刻画成了一名疯子科学家。
You must be mad to say that!
你那么说简直是疯了！
People all went mad with joy.
人们全都欣喜若狂。
crazy adj.〈尤美〉疯的。
(辨析)指精神失常或不理智的，常可与mad换用。
(例证) He feels so alone that he sometimes wonders if he's going crazy/mad.
他觉得非常孤单，有时候他怀疑自己是否快要发疯了。
A crazy/mad old woman lived in that room.
一个疯老太婆住在那个房间里。
(小贴士)表示患精神病时， mad与crazy均含冒犯之意，通常用 mentaly ill来代替。
frantic adj.发狂似的。
(辨析)指因极度焦虑或恐惧而情绪失控的。
(例证) His mother hasn't been able to reach him on his cellphone and is getting frantic.
他母亲一直打不通他的电话，急得快要发疯了。
She was frantic with worry.
她担心得要命。
hysterical adj.歇斯底里的。
(辨析)指因极端不安、担心、激动等而行为或情绪失控的。
(例证) hysterical screams
歇底里的尖叫
She became hysterical and began crying.
她变得歇斯底里，开始大哭起来。
He became almost hysterical when he heard the news.
他听到这个消息时几乎要发疯了。
