especially British EnglishBrEEXPRESS used when adding a stronger description of something 更不用说,甚至可以说
The information is inadequate, not to say misleading.
信息不够充分,更不用说还会误导别人。
Examples from the Corpus
not to say• Both men wieldwonderful, not to saymythic, influence to this day.• This is not to say that all criticism is unjustified.• That's not to say that all the tracks will be jazz-heavy.• That is not to say that he was not interested in spending it.• That is not to say that Reagan was not content to see socialists replaced by conservatives in the natural course of events.• That is not to say that the quality of information upon which decisions were made and discretionexercised was always adequate.• Which is not to say they were an unendingpleasure.