Synonyms for Acerbic (same or very similar meaning)
WordNet sense 1 (sour or bitter in taste):
astringent, acerbWordNet sense 2 (having a sharp biting taste):
sourWordNet sense 3 (harsh or corrosive in tone):
acid, acrid, bitter, blistering, caustic, sulfurous, venomous, virulent, vitriolic, sulphurousWordNet sense 4 (disagreeable to the senses, to the mind, or feelings ):
unpleasantFrom the ODE community, based on WordNetadd/edit