venomously
Adverb
Meaning
in a very malevolent manner
Source: WordNetSynonyms
poisonously
spitefully
violently
fatally
wildly
brutally
madly
cruelly
savagely
wickedly
severely
ruthlessly
unkindly
menacingly
nastily
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Antonyms
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My invite must have gotten lost in the mail," she said venomously. "But I don't mind crashing this party. -Maximum Ride talking to Max II.