Answer: caustic

AnswerCrossword Clue
CAUSTICThat's a lye!
caustica corrosive substance
causticsharply critical or sarcastic
causticseverely critical or sarcastic.
causticcorroding
CAUSTICLike Don Rickles
CAUSTICHaving many barbs
CAUSTICHaving a bite
CAUSTICSearing
CAUSTICAcrimonious
CAUSTICTrivium "... Are the Ties That Bind"
CAUSTICAcid, as criticism
CAUSTICAcid
CAUSTICSeverely critical
CAUSTICBiting or corrosive
CAUSTICCutting.
CAUSTICLye, for example.
CAUSTICSharply sarcastic.
CAUSTICSatirical.
CAUSTICBiting.
CAUSTICSharp-tongued.
CAUSTICBiting
CAUSTICCorrosive
CAUSTICLike a sharp sense of humor
CAUSTICTart
CAUSTICIncisively sarcastic
CAUSTICHardly conciliatory
CAUSTICScathing