rancor

/ˈræŋkər/
noun
  1. A deep, long-lasting feeling of bitterness or hatred toward someone, often because of a past wrong or unfair treatment.
    • The peace talks failed because both sides still held rancor over old conflicts.
    • Years of unfair treatment filled him with rancor toward his former boss.
    • She tried to let go of her rancor and forgive her friend for the mistake.
Antonyms
What does "rancor" mean? | whatsthatwordmean | whatsthatwordmean