Synonyms of virulent

1. deadly, venomous, virulent, toxic (vs. nontoxic): usage: extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite"
2. virulent (vs. avirulent), highly infective, deadly: usage: infectious; having the ability to cause disease
3. acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic, unpleasant (vs. pleasant): usage: 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"