vengefully
Adverb
Meaning
in a vindictive, revengeful manner
Source: WordNetSynonyms
vindictively
revengefully
violently
brutally
cruelly
savagely
ruthlessly
malevolently
unchristianly
inexorably
meanly
viciously
mercilessly
maliciously
spitefully
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Antonyms
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he plotted vindictively against his former superiors