"Discontent" is when you're not happy or satisfied with something. For example, if your favourite toy broke, you might feel discontent because you wish it was still working. It's like a feeling of unhappiness or disappointment.
Which of these examples is the odd one out?
She hid her discontent well, but inside, she was not happy with the current situation
Her heart flooded with discontent after receiving the promotion
There is a growing sense of discontent among the public regarding the government's policies
Even though she had many toys, the child was filled with discontent because she wanted more
Despite receiving a lot of praise for his work, he couldn't shake off his feelings of discontent at the job