He is completely ignorant about modern technology.

他对现代科技一无所知。

youdao

That tells me that a lot of parents are completely ignorant about peer pressure.

这告诉我们，很多家长完全地忽略了同龄人的压力。

youdao

Although he takes exercise in the park every day, he is completely ignorant of what happened there yesterday.

虽然他每天到公园里锻炼身体，但却对昨天那里发生的事情一无所知。

youdao

(Speaking) "Scientists in their institutes feel like serfs who work for completely ignorant people who do not know what they are talking about,".

VOA: standard.2010.02.03

There is a huge amount of context on TV that the web is completely ignorant of.

FORBES: Flingo: Ashwin Navin Talks Smart TV And Why Google, Apple Missed So Far

That is why Darwin himself could credibly propose his theory while being completely ignorant of the mechanisms of heredity.

FORBES: Evolution and Embodied Physiology

Lower courts have used this ruling to uphold convictions, even in death-penalty cases, in which the defence lawyer was drunk, asleep during the trial or completely ignorant of the relevant law.

ECONOMIST: The criminal law