She was so tired (that) she couldn't think straight.

她累得昏头昏脑。

《牛津词典》

He is not arguing, as many do, that we can no longer think straight because we do not talk proper.

他并不是像许多人那样，认为我们由于说话不得体而无法清晰地思考。

youdao

He won't be able to think straight.

他不能清醒地思考。

youdao

In other words, he no longer can think straight and so he will do something dangerous,harmful, and very ultimately bad for himself,and when he does whatever it is, he is struck by Nemesis,the goddess of retribution.

换句话说,他已经不能理性思考,他会对自己做出危险,有害,甚至及其恶劣的事,无论他做了什么坏事,最终会被惩戒女神尼弥西斯制裁

耶鲁公开课 - 古希腊历史简介课程节选

I think even if you're in a chair, and you're sitting up straight with good posture, maybe hands on knees.

哪怕只是坐在椅子上，坐直并保持良好姿势，也许双手放在两膝上。

普林斯顿公开课 - 人性课程节选

So you can think of it, if we were to just think of it as a straight line that we were going across, essentially what we're saying is that we're getting from point a to point c without ever getting through point b.

你们可以来想想看，如我我们把它想成是一条直线,我们要沿着这条线经过，这就是说我们要从ａ点,不经过ｂ点而到ｃ点。

麻省理工公开课 - 化学原理课程节选

Her book, Can't Think Straight: A Memoir of Mixed-Up Love, will be published Dec. 28, 2010.

FORBES: Magazine Article

Critics said her children were "at risk of nutrient deficiencies" and "wouldn't be able to think straight".

BBC: Atkins and the never-ending battle over carbs

Break down his body and spirit -- through brutal training or prolonged combat -- until he can't think straight.

CNN: Why a man eats another man's heart