caustic (
http://definr.com/caustic)
adj 1: 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,
sulfurous,
sulphurous,
venomous,
virulent,
vitriolic]
2: of a substance, especially a strong acid; capable of
destroying or eating away by chemical action [syn:
corrosive,
erosive,
vitriolic]
n : any chemical substance that burns or destroys living tissue