不能指望他说真话。

He can't be relied on to tell the truth.

《牛津词典》

我要是你的话，我就会对他说真话了。

If I were you, I would tell the truth to him.

youdao

一个常说谎的人﹐当他说真话时﹐也不值相信。

A liar is not believed even though he tells the truth.

youdao

Well, Wright himself described that difficulty of writing his autobiography, and these are the terms he used: I found that to tell the truth is the hardest thing on earth, harder than fighting in a war, harder than taking part in a revolution.

莱特自己描述了,自传写作的艰辛，他如是说：,“我发现说真话是世界上最难的事，比参加战争难，比参加革命难，如果尝试写自传。

耶鲁公开课 - 1945年后的美国小说课程节选