这类证据在哲学上是不足为信的。

This kind of evidence is philosophically unconvincing.

《牛津词典》

可是历史表明这种承诺不足为信。

But history shows that such promises can't be trusted.

youdao

当然，单有这么一个结果不足为信，要谨慎对待。

A single such result must, of course, be treated with caution.

youdao

What the extential is called inauthentic, They can be misleading.

表达的话语不足为信，很容易误导人。

麻省理工公开课 - 电影哲学课程节选

Now there's a political and business history to this because KFC, as large a company as it is, is owned by a larger parent company, believe it or not, called Yum Brands.

这是它的行政和商业历史,因为像肯德基这样庞大的公司,为一个更为庞大的母公司所有,信不信由你,这个母公司叫做百胜餐饮集团

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选