impugn
词根词缀：
impugn v. 抨击
im 加以… + pugn 打斗 → 加以打击 → 抨击
pugnacious adj. 好斗的
pugn 打斗 + acious 多…的 → 多打斗的 → 好斗的
repugnance n. 反感
re 相反 + pugn 打斗 + ance 表状态，repugnant的名词 → 反感
repugnant adj. 反感的
re 相反 + pugn 打斗 + ant …的 → 反击 → 反感的
数据来源：新东方英语词汇速记大全
相关例句：
He may attempt to impugn the reputation of his victim.
他可能试图去诋毁他的受害者的名声。
The Secretary's letter questions my veracity and impugns my motives
部长的来信怀疑我的诚实，质疑我的动机。
They were daring to impugn the profession of medicine.
他们胆敢指责医药职业。
All I can hope is that the good name of the Bank will not be impugned in some way.
我所希望的，就是该银行的好名声不要在某些方面受到质疑。
Possessing an attitude of schadenfreude, the media not only dismiss, but would seek to impugn and deny China's leaders 'sincerity when they express the Chinese people's vital need for and yearning for peace and harmony with their Asian neighbors and with the United States.
持有这种幸灾乐祸的态度，媒体不仅会被驳回，而且会寻求抨击和否定中国领导人诚意&当他们表达中国人民对与亚洲邻国和美国的构建和平与和谐关系的迫切需要和向往的时候。
To tolerate Socrates would be to say to him that we care little for our way of life and that we are willing to let you challenge it and impugn it every day.
若是容忍苏格拉底，就像在对他说，我们不是很在意我们的生活方式，我们愿意让你提出挑战并日日进行抨击。