resentment
/ɹɪˈzɛntmənt/noun
A lasting feeling of anger or bitterness about being treated unfairly.
You 'harbor' or 'nurse' resentment 'toward' or 'against' someone. The word implies a grievance kept warm over time.
Related words
bitternessThe sharp, harsh quality of a bitter flavor.outrageA strong feeling of shock and anger caused by something unfair or offensive.hostilityUnfriendly or aggressive feelings or behavior toward someone.rageExtreme, uncontrolled anger.contemptA feeling that someone or something is worthless or beneath respect; scorn.annoyanceThe feeling of being irritated or mildly angered.