1) Acerb 2) Astringent 3) Barb-tongued 4) Biting 5) Bitter 6) Filled with sarcasm 7) Harsh or corrosive in tone 8) Like grapefruits 9) Like some wit 10) Sarcastic 11) Sharp 12) Sour 13) Sour or bitter 14) Sour or bitter in taste 15) Tart 
• (a.) Sour or severe.
A·cerb'ic adjective Sour or severe. 
acerb, acerbic Having a bitter or sour taste; sharp or bitter in temper, mood, or expression.
sour or astringent in taste: Lemon juice is acerbic. · harsh or severe, as of temper or expression: acerbic criticism.
[SAT terms] harsh or corrosive in tone harsh or corrosive in tone