How to sign: 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;
Similiar / Same: acid, blistering, caustic, sulfurous, vitriolic, acerb, acerbic, acrid, venomous, bitter, virulent