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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, sulphurous, acerb, acerbic, acrid, venomous, bitter, virulent
How to sign: of a substance, especially a strong acid; capable of destroying or eating away by chemical action