Synonyms: incisive, trenchant, biting, cutting, crisp

These adjectives refer to keenness and forcefulness of thought, expression, or intellect. 

• Incisive and trenchant suggest penetration to the heart of a subject and clear, sharp, and vigorous expression: an incisive report; trenchant wit. 
• Biting and cutting often have a sarcastic or sardonic quality capable of wounding or stinging: "Biting remarks revealed her attitude of contempt" D.H. Lawrence. "He can say the driest, most cutting things in the quietest of tones" Charlotte Brontë. 
• Crisp suggests clarity, conciseness, and briskness: a crisp retort.

... Am-Heritage