他犯了严重的错误。用英语怎么说？

他犯了严重的错误。

He made a gross mistake.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

made

adj. …制的，（人工）做成的，拼成的，虚构的，保证成功的；v. 使(make的过去式和过去分词)；

例句
Single people are treated as an aberration and made to pay a supplement.
独身者被当成异类，而且要付一笔额外的费用。

gross

adj. 总的，严重的，令人不快的，粗鲁的；n. 总收入，罗（一罗为144个）；vt. 总共收入为，总共赚得；adv. 总共，全部；

例句
Expenses are deductible only to the extent that in aggregate they exceed 7 percent of gross income.
只有在消费总额超过总收入的7%时才可免税。

mistake

n. 错误，过失，误解，差错，口误，笔误，失策，失误；vt.& vi. 弄错，误解；vt. 认不出，误会，看错；vi. 弄错，误解；

例句
Her mistake was to blab about their affair...
她错在说出了他们的婚外情。