deadly, venomous, virulent -- (extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite")
virulent -- (infectious; having the ability to cause disease)
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")
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