Severely caustic, scathing (9)
I believe the answer is:
vitriolic
(Other definitions for vitriolic that I've seen before include "Scathing" , "Severely bitter" , "Cruelly savage (criticism)" , "Highly corrosive" , "Filled with malice" .)
I believe the answer is:
vitriolic
(Other definitions for vitriolic that I've seen before include "Scathing" , "Severely bitter" , "Cruelly savage (criticism)" , "Highly corrosive" , "Filled with malice" .)