to say nothing ofI never suggested that he was incompetent, still less that he was dishonest
I never suggested that he was incompetent, still less that he was dishonest
let alone, much less, never mind
not to mention
in 1721
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。