[adj] 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"
[adj] sour or bitter in taste
acerb, acid, acrid, astringent, bitter, blistering, caustic, sharp, sour, sulfurous, sulphurous, unpleasant, venomous, virulent, vitriolic
\A*cerb"ic\, a. Sour or severe.