He's not a friend, you say, yet you saw fit to lend him money.

你说他不是你的朋友，你却执意借钱给他。

《柯林斯英汉双解大词典》

He is not a friend of mine.

他不算是我朋友中的一个。

youdao

Emotional turmoil is not a friend of truth.

情绪躁动不是真理的朋友。

youdao

You may give a cold shoulder to a friend who has not kept a promise he made to you.

VOA: special.2009.12.13

For example, I can-- and having the past experience-- envy towards my best friend, that in and of itself does not make me a bad person.

举个例子，我可以…,因为以前的经历-,嫉妒我最好的朋友，那种情绪本身不代表我是个坏人。

哈佛公开课 - 幸福课课程节选

And you friend suggests you go to the movies but you really would not like to see a movie.

你的朋友提议去看电影，可你并不想去。

I'd rather 课堂 - SpeakingMax英语口语达人

By May 2010 it was abundantly clear that Erdogan was not a friend of Israel.

CENTERFORSECURITYPOLICY: Dreamy foreign policies

But it is time to see Mr Putin as a challenger, and not a friend.

ECONOMIST: Vladimir Putin takes on democracy, the West and all-comers

For the Soviet Union, the Islamic Revolution ushered into power an enemy of its enemy, but not a friend.

WSJ: Book Review: Strange Rebels