n.自信;果断
Her assertiveness was starting to be seen as arrogance. 她的自信已开始被认为是自负了。
The assertiveness training is very helpful for improving one's social skill. 自信训练对提高社交技巧很有帮助。
You should learn to use your own assertiveness to get the things you want. 你应当学会用自己的果断得到想要的东西。