慎重さが足りなくて彼が失敗したのは明らかだ。の英語

It is clear that he failed for lack of prudence.

His failure was in reality due to his lack of care.

He should reflect on his failure.

I tried to attract his attention, but failed.

I was astonished to hear that he failed.

I was surprised that he had failed.

He steeled himself against possible failure.

It is no wonder that he failed.

He made light of the matter, and failed.

I expect him to get over the shock of his failure.

I knew from the first―I knew all along―It was a foregone conclusion―that he would fail.

He tried hard, but he failed.

With a little more care, he wouldn't have failed.

His failure resulted from his carelessness.

he was certain to fail

It is no wonder that he failed.

He should reflect on his failure.

He tried hard, but failed.

He tried hard but failed.

I knew all along that he would fail

His failure was a foregone conclusion.

He takes his failure seriously （to heart）.

He studied hard for fear he should fail.

He studied hard so he wouldn't fail.

It is a great pity―deeply to be regretted―that he has failed.

I was disappointed at news of his failure

His failure was a disappointment to me.

His failure was mainly due to carelessness.

He is extremely apprehensive of failure.

The pity is that he has failed.