not to say造句

I found the characters very two-dimensional, not to say dull.
我觉得那些人物形象即使不说是乏味无聊，至少也是毫无深度。

She warned me not to say anything to upset him.
她警告我不要说任何让他不高兴的话。

He made up his mind not to say a word.
他打定主意一句话也不说.