Source : Webster's Revised Unabridged Dictionary (1913)

Acerbic \A*cerb"ic\, a.
   Sour or severe.

Source : WordNet®

acerbic
     adj 1: sour or bitter in taste [syn: {acerb}, {astringent}, {sharp}]
     2: 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}, {acid}, {acrid}, {bitter},
         {blistering}, {caustic}, {sulfurous}, {sulphurous}, {venomous},
         {virulent}, {vitriolic}]