resentment

Resentment is a strong feeling of bitterness and anger that comes from being unfairly treated or hurt by someone. You can feel resentment towards a person who took advantage of you.

When people talk about resentment, they usually mean it's an emotion that builds up over time, often because someone has done something hurtful or wrong to them. It's like a slow-burning fire that gets bigger and more intense as the days go by. For example, if your friend borrowed money from you and never paid it back, you might start feeling resentment towards them. If you're stuck in a traffic jam on your way to work every day because of construction, you might feel resentment towards the government for not doing anything about it.