vindictively
Adverb
Meaning
in a vindictive, revengeful manner
Source: WordNetSynonyms
vengefully
revengefully
adversely
brutally
cruelly
savagely
ruthlessly
disagreeably
nastily
evilly
malevolently
hostilely
incompatibly
malignantly
malignly
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Antonyms
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he plotted vindictively against his former superiors