不懂用英语怎么说

不懂用英语是ignorant of。

ignorant of

词义：动词：不知道；不懂。

固定搭配：be utterly ignorant of 一无所知 ; 完全无知 ; 一窍不通。

例句：

1、Don't I know how old she is; eight years old and ignorant of everything. 我不知道她多大了吗？八岁，什么都不懂。

2、That doesn't mean the market has any right to be ignorant of events that are barreling down the pike toward it. 那并不意味着市场有权对纷至沓来的重大事件一无所知。