incisive, incisively, incisiveness 1. Quick to understand, analyze, or act. 2. Characterized by clear and direct expression. 3. Penetrating, clear, and sharp, as in operation or expression: 'an incisive mind'; 'incisive comments'. 4. Marked by clear, penetrating thought; mentally 'sharp': 'incisive remarks'. Found on http://www.wordinfo.info/words/index/info/view_unit/482/2