He has no ability to reason logically at all.とは 意味・読み方・使い方

His reason failed him.

He has not the wit to see that―not wit enough to understand that.

He has no authority to settle the question.

He's not smart enough to do math in his head.

He is wanting in judgment. He has, in common parlance, no head.

He is wanting judgment. He has, in common parlance, no head.

he was in such a state you just couldn't reason with him

the unsoundness of his conclusion was obvious

He doesn't have enough brains to do sums in his head.

He isn't smart enough to add up numbers in his head.

He's not smart enough to add numbers in his head.

Nothing can mitigate his misconduct.

There is no definitive evidence against him.

He doesn't have enough brains to do sums in his head.

He isn't smart enough to do mental arithmetic.

He isn't smart enough to add up numbers in his head.

He's not smart enough to add numbers in his head.

much too perspicacious to be taken in by such a spurious argument

He recognizes the error of his ways.

His argument was so logical and cogent that there was no refuting it.

He is not witty or bright.

Nothing could make him change his mind [shake his resolution].

From an objective viewpoint, his argument was far from rational.

I cannot help doubting his sincerity.

He lacks the merest grain of common sense.

he is apt to ignore matters he considers unimportant

His total disregard for the feelings of others was his condemnation.

Just because he's wise, doesn't mean that he's honest.

He is too wise not to know that.

He's rigid in his opinions.