不懂用英語是ignorant of。
ignorant of
詞義：動詞：不知道；不懂。
固定搭配：be utterly ignorant of 壹無所知 ; 完全無知 ; 壹竅不通。
例句：
1、Don't I know how old she is; eight years old and ignorant of everything. 我不知道她多大了嗎？八歲，什麽都不懂。
2、That doesn't mean the market has any right to be ignorant of events that are barreling down the pike toward it. 那並不意味著市場有權對紛至沓來的重大事件壹無所知。