"virulent" in the adjective sense
1. deadly, venomous, virulent
extremely poisonous or injurious producing venom
"venomous snakes"
"a virulent insect bite"
2. virulent
infectious having the ability to cause disease
3. acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic
harsh or corrosive in tone
"an acerbic tone piercing otherwise flowery prose"
"a barrage of acid comments"
"her acrid remarks make her many enemies"
"bitter words"
"blistering criticism"
"caustic jokes about political assassination, talk-show hosts and medical ethics"
"a sulfurous denunciation"
"a vitriolic critique"
Source: WordNet® (An amazing lexical database of English)
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