“强硬地”的英语可以翻译为：toughly，with a strong hand，tough ...

他能一面快速地吃饭，一面言辞强硬地说话，给同他一起就餐的人留下了很好的印象。His ability to talk tough while eating fast made a favourable impression on his dining companions.我十分强硬地向那些人宣称北约需要转变方向。I brashly announced to the group that NATO needed to be turned ...