不耐烦 means be impatient of or be wary of (something or someone )
For example
1. the monitor of my class is an arrogant guy, he often patronizes others, so every time i ask him something, he answers with 不耐烦的语气
2. 我已经等他一个小时了,可他还没来,我已经等得不耐烦了!
3. 你得对你的学生有点儿耐心,不要总是不耐烦!