Clare's assertiveness stirred up his deep-seated sense of inadequacy.克莱尔的自信触动了他内心深处的自卑感。

the growing assertiveness of Britain's trade unions英国工会日益严重的武断倾向

I'm considering assertiveness training as I have a tendency to avoid confrontation.我有逃避正面冲突的倾向, 所以在考虑参加自信心训练。

You need to improve your assertiveness skills.你需要变得更加自信。