virulent (
http://definr.com/virulent)
adj 1: extremely poisonous or injurious; producing venom; "venomous
snakes"; "a virulent insect bite" [syn:
deadly,
venomous]
2: infectious; having the ability to cause disease [ant:
avirulent]
3: 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" [syn:
acerb,
acerbic,
acid,
acrid,
bitter,
blistering,
caustic,
sulfurous,
sulphurous,
venomous,
vitriolic]