im·pugn 
/ɪmˈpju:n/ verb
im·pugns; im·pugned; im·pugn·ing /ɪmˈpju:n/ verb [+ obj] formal : to criticize (a person's character, intentions, etc.) by suggesting that someone is not honest and should not to be trusted
▪ He impugned his rival's character. ▪ Her motives have been scrutinized and impugned.
▪ He impugned his rival's character. ▪ Her motives have been scrutinized and impugned.
