confidant
单词辨析：
指见面点头的熟人，但还不是朋友。
She is not my friend, just an acquaintance.
她不是我的朋友，只是一个熟人。
His acquaintances are many, but his friends are few.
他的熟人不少，朋友却没几个。
指可倾诉衷肠、忠诚可靠之人。
He is my confidant.
他是我的知己。
The middle-aged woman regarded the boy as her confidant.
这个中年女人把那个男孩当作心腹朋友。
confidante 指女性知己、密友。
普通用词，多用于口语，尤指特别要好的朋友。
He is my pal at school.
他是我学校里的密友。
We've been pals since childhood.
我们打小就是好伙伴。
相关例句：
Colonel house was a friend and confidant of President wilson.
豪斯上校是威尔逊总统的朋友和知己。
I have only one confidant to whom I can tell my secrets.
我只有一个可以告诉我秘密的知己。
A close friend or confidant.
至交亲密的朋友或知己。
She unbosomed her secret to her confidant.
她向知己吐露自己的秘密。
I convey my feelings to him that to be his female confidant many times.
多次表达了欲和他成为异性朋友之意。
Not one of her heroines ever shares everything with a true confidant, and everybody has secrets.
她的女主人公中没有任何一个人会把所有的心里话与真正的知己分享，人人各怀心事。