revengefully

/rɪˈvɛndʒfəli/
adverb
  1. In a way that shows a desire to harm someone because they have harmed you; with a spirit of revenge.
    • She glared revengefully at the person who had stolen her idea.
    • He revengefully spread rumors about his former friend.
    • The defeated team vowed revengefully to train harder for the next match.