VERB
指责,非难,质疑(他人的动机、诚信等)
If you impugn something such as someone's motives or integrity, you imply that they are not entirely honest or honourable.
例句
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。
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。