faithful to sth 忠实于...
He remained faithful to the ideals of the party.

familiar to sb 为某人所熟悉
The smell is very familiar to everyone who lives near a bakery.

familiar with 通晓，熟悉
Are you familiar with the computer software they use?

fatal to 致命的
it'd be fatal to try and stop them now.

favorable to 支持，赞成
The result would not be favorable to religous figures.

fearful of/of doing sth 惧怕
Parents are very fearful for their children.

fit for sth 适于
I am going to be fitted for my wedding dress today.

foreign to 陌生的，非典型的
Dishonest is foreign to his nature.

frank with 对...坦率
To be frank with you, I think your son has little charge of passing the exam.

free of/from 不受...免于...
It was several weeks before he was completely free of pain.

friendly with 与...友好
We soon become friendly with the couple next door.

frustrated at 因...而沮丧
They felt frustrated at lack of progress.

guilty of 有...罪的
The jury found the defendant not guilty of the offence.

hard on 对...严厉
Don't be too hard on him-he's very young.

hungry for 渴望
Both parties are hungry for power.